diff --git a/CHANGELOG.md b/CHANGELOG.md
index f07f612b..3f1cc985 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,28 @@
+3.13.1 / 2019-04-05
+-------------------
+
+- Fix possible code execution in (already unsafe) `.load()`, #480.
+
+
+3.13.0 / 2019-03-20
+-------------------
+
+- Security fix: `safeLoad()` can hang when arrays with nested refs
+  used as key. Now throws exception for nested arrays. #475.
+
+
+3.12.2 / 2019-02-26
+-------------------
+
+- Fix `noArrayIndent` option for root level, #468.
+
+
+3.12.1 / 2019-01-05
+-------------------
+
+- Added `noArrayIndent` option, #432.
+
+
 3.12.0 / 2018-06-02
 -------------------
 
diff --git a/README.md b/README.md
index c165c357..03a9e5ae 100644
--- a/README.md
+++ b/README.md
@@ -104,7 +104,7 @@ options:
 - `filename` _(default: null)_ - string to be used as a file path in
   error/warning messages.
 - `onWarning` _(default: null)_ - function to call on warning messages.
-  Loader will throw on warnings if this function is not provided.
+  Loader will call this function with an instance of `YAMLException` for each warning.
 - `schema` _(default: `DEFAULT_SAFE_SCHEMA`)_ - specifies a schema to use.
   - `FAILSAFE_SCHEMA` - only strings, arrays and plain objects:
     http://www.yaml.org/spec/1.2/spec.html#id2802346
@@ -170,6 +170,7 @@ disable exceptions by setting the `skipInvalid` option to `true`.
 options:
 
 - `indent` _(default: 2)_ - indentation width to use (in spaces).
+- `noArrayIndent` _(default: false)_ - when true, will not add an indentation level to array elements
 - `skipInvalid` _(default: false)_ - do not throw on invalid types (like function
   in the safe schema) and skip pairs and single values with such types.
 - `flowLevel` (default: -1) - specifies level of nesting, when to switch from
diff --git a/dist/js-yaml.js b/dist/js-yaml.js
index 0c9e648b..fad044a4 100644
--- a/dist/js-yaml.js
+++ b/dist/js-yaml.js
@@ -1,4 +1,4 @@
-/* js-yaml 3.12.0 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+/* js-yaml 3.13.1 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 'use strict';
 
 
@@ -208,16 +208,17 @@ function encodeHex(character) {
 }
 
 function State(options) {
-  this.schema       = options['schema'] || DEFAULT_FULL_SCHEMA;
-  this.indent       = Math.max(1, (options['indent'] || 2));
-  this.skipInvalid  = options['skipInvalid'] || false;
-  this.flowLevel    = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
-  this.styleMap     = compileStyleMap(this.schema, options['styles'] || null);
-  this.sortKeys     = options['sortKeys'] || false;
-  this.lineWidth    = options['lineWidth'] || 80;
-  this.noRefs       = options['noRefs'] || false;
-  this.noCompatMode = options['noCompatMode'] || false;
-  this.condenseFlow = options['condenseFlow'] || false;
+  this.schema        = options['schema'] || DEFAULT_FULL_SCHEMA;
+  this.indent        = Math.max(1, (options['indent'] || 2));
+  this.noArrayIndent = options['noArrayIndent'] || false;
+  this.skipInvalid   = options['skipInvalid'] || false;
+  this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys      = options['sortKeys'] || false;
+  this.lineWidth     = options['lineWidth'] || 80;
+  this.noRefs        = options['noRefs'] || false;
+  this.noCompatMode  = options['noCompatMode'] || false;
+  this.condenseFlow  = options['condenseFlow'] || false;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.explicitTypes = this.schema.compiledExplicit;
@@ -837,13 +838,14 @@ function writeNode(state, level, object, block, compact, iskey) {
         }
       }
     } else if (type === '[object Array]') {
+      var arrayLevel = (state.noArrayIndent && (level > 0)) ? level - 1 : level;
       if (block && (state.dump.length !== 0)) {
-        writeBlockSequence(state, level, state.dump, compact);
+        writeBlockSequence(state, arrayLevel, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
         }
       } else {
-        writeFlowSequence(state, level, state.dump);
+        writeFlowSequence(state, arrayLevel, state.dump);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
@@ -1005,6 +1007,8 @@ var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
 var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
 
 
+function _class(obj) { return Object.prototype.toString.call(obj); }
+
 function is_EOL(c) {
   return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
 }
@@ -1260,6 +1264,31 @@ function mergeMappings(state, destination, source, overridableKeys) {
 function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, startLine, startPos) {
   var index, quantity;
 
+  // The output is a plain object here, so keys can only be strings.
+  // We need to convert keyNode to a string, but doing so can hang the process
+  // (deeply nested arrays that explode exponentially using aliases).
+  if (Array.isArray(keyNode)) {
+    keyNode = Array.prototype.slice.call(keyNode);
+
+    for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
+      if (Array.isArray(keyNode[index])) {
+        throwError(state, 'nested arrays are not supported inside keys');
+      }
+
+      if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
+        keyNode[index] = '[object Object]';
+      }
+    }
+  }
+
+  // Avoid code execution in load() via toString property
+  // (still use its own toString for arrays, timestamps,
+  // and whatever user schema extensions happen to have @@toStringTag)
+  if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
+    keyNode = '[object Object]';
+  }
+
+
   keyNode = String(keyNode);
 
   if (_result === null) {
diff --git a/dist/js-yaml.min.js b/dist/js-yaml.min.js
index 0dcb7bac..0623500e 100644
--- a/dist/js-yaml.min.js
+++ b/dist/js-yaml.min.js
@@ -1 +1 @@
-!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).jsyaml=e()}}(function(){return function o(a,s,c){function u(t,e){if(!s[t]){if(!a[t]){var n="function"==typeof require&&require;if(!e&&n)return n(t,!0);if(l)return l(t,!0);var i=new Error("Cannot find module '"+t+"'");throw i.code="MODULE_NOT_FOUND",i}var r=s[t]={exports:{}};a[t][0].call(r.exports,function(e){return u(a[t][1][e]||e)},r,r.exports,o,a,s,c)}return s[t].exports}for(var l="function"==typeof require&&require,e=0;e<c.length;e++)u(c[e]);return u}({1:[function(e,t,n){"use strict";var i=e("./js-yaml/loader"),r=e("./js-yaml/dumper");function o(e){return function(){throw new Error("Function "+e+" is deprecated and cannot be used.")}}t.exports.Type=e("./js-yaml/type"),t.exports.Schema=e("./js-yaml/schema"),t.exports.FAILSAFE_SCHEMA=e("./js-yaml/schema/failsafe"),t.exports.JSON_SCHEMA=e("./js-yaml/schema/json"),t.exports.CORE_SCHEMA=e("./js-yaml/schema/core"),t.exports.DEFAULT_SAFE_SCHEMA=e("./js-yaml/schema/default_safe"),t.exports.DEFAULT_FULL_SCHEMA=e("./js-yaml/schema/default_full"),t.exports.load=i.load,t.exports.loadAll=i.loadAll,t.exports.safeLoad=i.safeLoad,t.exports.safeLoadAll=i.safeLoadAll,t.exports.dump=r.dump,t.exports.safeDump=r.safeDump,t.exports.YAMLException=e("./js-yaml/exception"),t.exports.MINIMAL_SCHEMA=e("./js-yaml/schema/failsafe"),t.exports.SAFE_SCHEMA=e("./js-yaml/schema/default_safe"),t.exports.DEFAULT_SCHEMA=e("./js-yaml/schema/default_full"),t.exports.scan=o("scan"),t.exports.parse=o("parse"),t.exports.compose=o("compose"),t.exports.addConstructor=o("addConstructor")},{"./js-yaml/dumper":3,"./js-yaml/exception":4,"./js-yaml/loader":5,"./js-yaml/schema":7,"./js-yaml/schema/core":8,"./js-yaml/schema/default_full":9,"./js-yaml/schema/default_safe":10,"./js-yaml/schema/failsafe":11,"./js-yaml/schema/json":12,"./js-yaml/type":13}],2:[function(e,t,n){"use strict";function i(e){return null==e}t.exports.isNothing=i,t.exports.isObject=function(e){return"object"==typeof e&&null!==e},t.exports.toArray=function(e){return Array.isArray(e)?e:i(e)?[]:[e]},t.exports.repeat=function(e,t){var n,i="";for(n=0;n<t;n+=1)i+=e;return i},t.exports.isNegativeZero=function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},t.exports.extend=function(e,t){var n,i,r,o;if(t)for(n=0,i=(o=Object.keys(t)).length;n<i;n+=1)e[r=o[n]]=t[r];return e}},{}],3:[function(e,t,n){"use strict";var c=e("./common"),d=e("./exception"),i=e("./schema/default_full"),r=e("./schema/default_safe"),l=Object.prototype.toString,u=Object.prototype.hasOwnProperty,o=9,h=10,a=32,m=33,g=34,y=35,x=37,v=38,A=39,b=42,w=44,C=45,k=58,j=62,S=63,I=64,E=91,O=93,F=96,_=123,N=124,M=125,s={0:"\\0",7:"\\a",8:"\\b",9:"\\t",10:"\\n",11:"\\v",12:"\\f",13:"\\r",27:"\\e",34:'\\"',92:"\\\\",133:"\\N",160:"\\_",8232:"\\L",8233:"\\P"},p=["y","Y","yes","Yes","YES","on","On","ON","n","N","no","No","NO","off","Off","OFF"];function f(e){var t,n,i;if(t=e.toString(16).toUpperCase(),e<=255)n="x",i=2;else if(e<=65535)n="u",i=4;else{if(!(e<=4294967295))throw new d("code point within a string may not be greater than 0xFFFFFFFF");n="U",i=8}return"\\"+n+c.repeat("0",i-t.length)+t}function T(e){this.schema=e.schema||i,this.indent=Math.max(1,e.indent||2),this.skipInvalid=e.skipInvalid||!1,this.flowLevel=c.isNothing(e.flowLevel)?-1:e.flowLevel,this.styleMap=function(e,t){var n,i,r,o,a,s,c;if(null===t)return{};for(n={},r=0,o=(i=Object.keys(t)).length;r<o;r+=1)a=i[r],s=String(t[a]),"!!"===a.slice(0,2)&&(a="tag:yaml.org,2002:"+a.slice(2)),(c=e.compiledTypeMap.fallback[a])&&u.call(c.styleAliases,s)&&(s=c.styleAliases[s]),n[a]=s;return n}(this.schema,e.styles||null),this.sortKeys=e.sortKeys||!1,this.lineWidth=e.lineWidth||80,this.noRefs=e.noRefs||!1,this.noCompatMode=e.noCompatMode||!1,this.condenseFlow=e.condenseFlow||!1,this.implicitTypes=this.schema.compiledImplicit,this.explicitTypes=this.schema.compiledExplicit,this.tag=null,this.result="",this.duplicates=[],this.usedDuplicates=null}function L(e,t){for(var n,i=c.repeat(" ",t),r=0,o=-1,a="",s=e.length;r<s;)-1===(o=e.indexOf("\n",r))?(n=e.slice(r),r=s):(n=e.slice(r,o+1),r=o+1),n.length&&"\n"!==n&&(a+=i),a+=n;return a}function D(e,t){return"\n"+c.repeat(" ",e.indent*t)}function U(e){return e===a||e===o}function q(e){return 32<=e&&e<=126||161<=e&&e<=55295&&8232!==e&&8233!==e||57344<=e&&e<=65533&&65279!==e||65536<=e&&e<=1114111}function Y(e){return q(e)&&65279!==e&&e!==w&&e!==E&&e!==O&&e!==_&&e!==M&&e!==k&&e!==y}function R(e){return/^\n* /.test(e)}var B=1,P=2,W=3,K=4,$=5;function H(e,t,n,i,r){var o,a,s,c=!1,u=!1,l=-1!==i,p=-1,f=q(s=e.charCodeAt(0))&&65279!==s&&!U(s)&&s!==C&&s!==S&&s!==k&&s!==w&&s!==E&&s!==O&&s!==_&&s!==M&&s!==y&&s!==v&&s!==b&&s!==m&&s!==N&&s!==j&&s!==A&&s!==g&&s!==x&&s!==I&&s!==F&&!U(e.charCodeAt(e.length-1));if(t)for(o=0;o<e.length;o++){if(!q(a=e.charCodeAt(o)))return $;f=f&&Y(a)}else{for(o=0;o<e.length;o++){if((a=e.charCodeAt(o))===h)c=!0,l&&(u=u||i<o-p-1&&" "!==e[p+1],p=o);else if(!q(a))return $;f=f&&Y(a)}u=u||l&&i<o-p-1&&" "!==e[p+1]}return c||u?9<n&&R(e)?$:u?K:W:f&&!r(e)?B:P}function G(i,r,o,a){i.dump=function(){if(0===r.length)return"''";if(!i.noCompatMode&&-1!==p.indexOf(r))return"'"+r+"'";var e=i.indent*Math.max(1,o),t=-1===i.lineWidth?-1:Math.max(Math.min(i.lineWidth,40),i.lineWidth-e),n=a||-1<i.flowLevel&&o>=i.flowLevel;switch(H(r,n,i.indent,t,function(e){return function(e,t){var n,i;for(n=0,i=e.implicitTypes.length;n<i;n+=1)if(e.implicitTypes[n].resolve(t))return!0;return!1}(i,e)})){case B:return r;case P:return"'"+r.replace(/'/g,"''")+"'";case W:return"|"+V(r,i.indent)+Z(L(r,e));case K:return">"+V(r,i.indent)+Z(L(function(e,t){var n,i,r=/(\n+)([^\n]*)/g,o=(s=e.indexOf("\n"),s=-1!==s?s:e.length,r.lastIndex=s,z(e.slice(0,s),t)),a="\n"===e[0]||" "===e[0];var s;for(;i=r.exec(e);){var c=i[1],u=i[2];n=" "===u[0],o+=c+(a||n||""===u?"":"\n")+z(u,t),a=n}return o}(r,t),e));case $:return'"'+function(e){for(var t,n,i,r="",o=0;o<e.length;o++)55296<=(t=e.charCodeAt(o))&&t<=56319&&56320<=(n=e.charCodeAt(o+1))&&n<=57343?(r+=f(1024*(t-55296)+n-56320+65536),o++):(i=s[t],r+=!i&&q(t)?e[o]:i||f(t));return r}(r)+'"';default:throw new d("impossible error: invalid scalar style")}}()}function 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Implicit resolving of such types is not supported.")}),this.compiledImplicit=a(this,"implicit",[]),this.compiledExplicit=a(this,"explicit",[]),this.compiledTypeMap=function(){var e,t,n={scalar:{},sequence:{},mapping:{},fallback:{}};function i(e){n[e.kind][e.tag]=n.fallback[e.tag]=e}for(e=0,t=arguments.length;e<t;e+=1)arguments[e].forEach(i);return n}(this.compiledImplicit,this.compiledExplicit)}s.DEFAULT=null,s.create=function(){var e,t;switch(arguments.length){case 1:e=s.DEFAULT,t=arguments[0];break;case 2:e=arguments[0],t=arguments[1];break;default:throw new r("Wrong number of arguments for Schema.create function")}if(e=i.toArray(e),t=i.toArray(t),!e.every(function(e){return e instanceof s}))throw new r("Specified list of super schemas (or a single Schema object) contains a non-Schema object.");if(!t.every(function(e){return e instanceof o}))throw new r("Specified list of YAML types (or a single Type object) contains a non-Type object.");return new s({include:e,explicit:t})},t.exports=s},{"./common":2,"./exception":4,"./type":13}],8:[function(e,t,n){"use strict";var i=e("../schema");t.exports=new i({include:[e("./json")]})},{"../schema":7,"./json":12}],9:[function(e,t,n){"use strict";var i=e("../schema");t.exports=i.DEFAULT=new i({include:[e("./default_safe")],explicit:[e("../type/js/undefined"),e("../type/js/regexp"),e("../type/js/function")]})},{"../schema":7,"../type/js/function":18,"../type/js/regexp":19,"../type/js/undefined":20,"./default_safe":10}],10:[function(e,t,n){"use strict";var i=e("../schema");t.exports=new i({include:[e("./core")],implicit:[e("../type/timestamp"),e("../type/merge")],explicit:[e("../type/binary"),e("../type/omap"),e("../type/pairs"),e("../type/set")]})},{"../schema":7,"../type/binary":14,"../type/merge":22,"../type/omap":24,"../type/pairs":25,"../type/set":27,"../type/timestamp":29,"./core":8}],11:[function(e,t,n){"use strict";var i=e("../schema");t.exports=new i({explicit:[e("../type/str"),e("../type/seq"),e("../type/map")]})},{"../schema":7,"../type/map":21,"../type/seq":26,"../type/str":28}],12:[function(e,t,n){"use strict";var i=e("../schema");t.exports=new i({include:[e("./failsafe")],implicit:[e("../type/null"),e("../type/bool"),e("../type/int"),e("../type/float")]})},{"../schema":7,"../type/bool":15,"../type/float":16,"../type/int":17,"../type/null":23,"./failsafe":11}],13:[function(e,t,n){"use strict";var i=e("./exception"),r=["kind","resolve","construct","instanceOf","predicate","represent","defaultStyle","styleAliases"],o=["scalar","sequence","mapping"];t.exports=function(t,e){if(e=e||{},Object.keys(e).forEach(function(e){if(-1===r.indexOf(e))throw new i('Unknown option "'+e+'" is met in definition of "'+t+'" YAML type.')}),this.tag=t,this.kind=e.kind||null,this.resolve=e.resolve||function(){return!0},this.construct=e.construct||function(e){return e},this.instanceOf=e.instanceOf||null,this.predicate=e.predicate||null,this.represent=e.represent||null,this.defaultStyle=e.defaultStyle||null,this.styleAliases=function(e){var n={};return null!==e&&Object.keys(e).forEach(function(t){e[t].forEach(function(e){n[String(e)]=t})}),n}(e.styleAliases||null),-1===o.indexOf(this.kind))throw new i('Unknown kind "'+this.kind+'" is specified for "'+t+'" YAML type.')}},{"./exception":4}],14:[function(e,t,n){"use strict";var c;try{c=e("buffer").Buffer}catch(e){}var i=e("../type"),u="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r";t.exports=new i("tag:yaml.org,2002:binary",{kind:"scalar",resolve:function(e){if(null===e)return!1;var t,n,i=0,r=e.length,o=u;for(n=0;n<r;n++)if(!(64<(t=o.indexOf(e.charAt(n))))){if(t<0)return!1;i+=6}return i%8==0},construct:function(e){var t,n,i=e.replace(/[\r\n=]/g,""),r=i.length,o=u,a=0,s=[];for(t=0;t<r;t++)t%4==0&&t&&(s.push(a>>16&255),s.push(a>>8&255),s.push(255&a)),a=a<<6|o.indexOf(i.charAt(t));return 0==(n=r%4*6)?(s.push(a>>16&255),s.push(a>>8&255),s.push(255&a)):18==n?(s.push(a>>10&255),s.push(a>>2&255)):12==n&&s.push(a>>4&255),c?c.from?c.from(s):new c(s):s},predicate:function(e){return c&&c.isBuffer(e)},represent:function(e){var t,n,i="",r=0,o=e.length,a=u;for(t=0;t<o;t++)t%3==0&&t&&(i+=a[r>>18&63],i+=a[r>>12&63],i+=a[r>>6&63],i+=a[63&r]),r=(r<<8)+e[t];return 0==(n=o%3)?(i+=a[r>>18&63],i+=a[r>>12&63],i+=a[r>>6&63],i+=a[63&r]):2==n?(i+=a[r>>10&63],i+=a[r>>4&63],i+=a[r<<2&63],i+=a[64]):1==n&&(i+=a[r>>2&63],i+=a[r<<4&63],i+=a[64],i+=a[64]),i}})},{"../type":13}],15:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:bool",{kind:"scalar",resolve:function(e){if(null===e)return!1;var t=e.length;return 4===t&&("true"===e||"True"===e||"TRUE"===e)||5===t&&("false"===e||"False"===e||"FALSE"===e)},construct:function(e){return"true"===e||"True"===e||"TRUE"===e},predicate:function(e){return"[object Boolean]"===Object.prototype.toString.call(e)},represent:{lowercase:function(e){return e?"true":"false"},uppercase:function(e){return e?"TRUE":"FALSE"},camelcase:function(e){return e?"True":"False"}},defaultStyle:"lowercase"})},{"../type":13}],16:[function(e,t,n){"use strict";var i=e("../common"),r=e("../type"),o=new RegExp("^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*|[-+]?\\.(?:inf|Inf|INF)|\\.(?:nan|NaN|NAN))$");var a=/^[-+]?[0-9]+e/;t.exports=new r("tag:yaml.org,2002:float",{kind:"scalar",resolve:function(e){return null!==e&&!(!o.test(e)||"_"===e[e.length-1])},construct:function(e){var t,n,i,r;return n="-"===(t=e.replace(/_/g,"").toLowerCase())[0]?-1:1,r=[],0<="+-".indexOf(t[0])&&(t=t.slice(1)),".inf"===t?1==n?Number.POSITIVE_INFINITY:Number.NEGATIVE_INFINITY:".nan"===t?NaN:0<=t.indexOf(":")?(t.split(":").forEach(function(e){r.unshift(parseFloat(e,10))}),t=0,i=1,r.forEach(function(e){t+=e*i,i*=60}),n*t):n*parseFloat(t,10)},predicate:function(e){return"[object Number]"===Object.prototype.toString.call(e)&&(e%1!=0||i.isNegativeZero(e))},represent:function(e,t){var n;if(isNaN(e))switch(t){case"lowercase":return".nan";case"uppercase":return".NAN";case"camelcase":return".NaN"}else if(Number.POSITIVE_INFINITY===e)switch(t){case"lowercase":return".inf";case"uppercase":return".INF";case"camelcase":return".Inf"}else if(Number.NEGATIVE_INFINITY===e)switch(t){case"lowercase":return"-.inf";case"uppercase":return"-.INF";case"camelcase":return"-.Inf"}else if(i.isNegativeZero(e))return"-0.0";return n=e.toString(10),a.test(n)?n.replace("e",".e"):n},defaultStyle:"lowercase"})},{"../common":2,"../type":13}],17:[function(e,t,n){"use strict";var i=e("../common"),r=e("../type");t.exports=new r("tag:yaml.org,2002:int",{kind:"scalar",resolve:function(e){if(null===e)return!1;var t,n,i,r,o=e.length,a=0,s=!1;if(!o)return!1;if("-"!==(t=e[a])&&"+"!==t||(t=e[++a]),"0"===t){if(a+1===o)return!0;if("b"===(t=e[++a])){for(a++;a<o;a++)if("_"!==(t=e[a])){if("0"!==t&&"1"!==t)return!1;s=!0}return s&&"_"!==t}if("x"===t){for(a++;a<o;a++)if("_"!==(t=e[a])){if(!(48<=(i=e.charCodeAt(a))&&i<=57||65<=i&&i<=70||97<=i&&i<=102))return!1;s=!0}return s&&"_"!==t}for(;a<o;a++)if("_"!==(t=e[a])){if(!(48<=(n=e.charCodeAt(a))&&n<=55))return!1;s=!0}return s&&"_"!==t}if("_"===t)return!1;for(;a<o;a++)if("_"!==(t=e[a])){if(":"===t)break;if(!(48<=(r=e.charCodeAt(a))&&r<=57))return!1;s=!0}return!(!s||"_"===t)&&(":"!==t||/^(:[0-5]?[0-9])+$/.test(e.slice(a)))},construct:function(e){var t,n,i=e,r=1,o=[];return-1!==i.indexOf("_")&&(i=i.replace(/_/g,"")),"-"!==(t=i[0])&&"+"!==t||("-"===t&&(r=-1),t=(i=i.slice(1))[0]),"0"===i?0:"0"===t?"b"===i[1]?r*parseInt(i.slice(2),2):"x"===i[1]?r*parseInt(i,16):r*parseInt(i,8):-1!==i.indexOf(":")?(i.split(":").forEach(function(e){o.unshift(parseInt(e,10))}),i=0,n=1,o.forEach(function(e){i+=e*n,n*=60}),r*i):r*parseInt(i,10)},predicate:function(e){return"[object Number]"===Object.prototype.toString.call(e)&&e%1==0&&!i.isNegativeZero(e)},represent:{binary:function(e){return 0<=e?"0b"+e.toString(2):"-0b"+e.toString(2).slice(1)},octal:function(e){return 0<=e?"0"+e.toString(8):"-0"+e.toString(8).slice(1)},decimal:function(e){return e.toString(10)},hexadecimal:function(e){return 0<=e?"0x"+e.toString(16).toUpperCase():"-0x"+e.toString(16).toUpperCase().slice(1)}},defaultStyle:"decimal",styleAliases:{binary:[2,"bin"],octal:[8,"oct"],decimal:[10,"dec"],hexadecimal:[16,"hex"]}})},{"../common":2,"../type":13}],18:[function(e,t,n){"use strict";var o;try{o=e("esprima")}catch(e){"undefined"!=typeof window&&(o=window.esprima)}var i=e("../../type");t.exports=new i("tag:yaml.org,2002:js/function",{kind:"scalar",resolve:function(e){if(null===e)return!1;try{var t="("+e+")",n=o.parse(t,{range:!0});return"Program"===n.type&&1===n.body.length&&"ExpressionStatement"===n.body[0].type&&("ArrowFunctionExpression"===n.body[0].expression.type||"FunctionExpression"===n.body[0].expression.type)}catch(e){return!1}},construct:function(e){var t,n="("+e+")",i=o.parse(n,{range:!0}),r=[];if("Program"!==i.type||1!==i.body.length||"ExpressionStatement"!==i.body[0].type||"ArrowFunctionExpression"!==i.body[0].expression.type&&"FunctionExpression"!==i.body[0].expression.type)throw new Error("Failed to resolve function");return i.body[0].expression.params.forEach(function(e){r.push(e.name)}),t=i.body[0].expression.body.range,"BlockStatement"===i.body[0].expression.body.type?new Function(r,n.slice(t[0]+1,t[1]-1)):new Function(r,"return "+n.slice(t[0],t[1]))},predicate:function(e){return"[object Function]"===Object.prototype.toString.call(e)},represent:function(e){return e.toString()}})},{"../../type":13}],19:[function(e,t,n){"use strict";var i=e("../../type");t.exports=new i("tag:yaml.org,2002:js/regexp",{kind:"scalar",resolve:function(e){if(null===e)return!1;if(0===e.length)return!1;var t=e,n=/\/([gim]*)$/.exec(e),i="";if("/"===t[0]){if(n&&(i=n[1]),3<i.length)return!1;if("/"!==t[t.length-i.length-1])return!1}return!0},construct:function(e){var t=e,n=/\/([gim]*)$/.exec(e),i="";return"/"===t[0]&&(n&&(i=n[1]),t=t.slice(1,t.length-i.length-1)),new RegExp(t,i)},predicate:function(e){return"[object RegExp]"===Object.prototype.toString.call(e)},represent:function(e){var t="/"+e.source+"/";return e.global&&(t+="g"),e.multiline&&(t+="m"),e.ignoreCase&&(t+="i"),t}})},{"../../type":13}],20:[function(e,t,n){"use strict";var i=e("../../type");t.exports=new i("tag:yaml.org,2002:js/undefined",{kind:"scalar",resolve:function(){return!0},construct:function(){},predicate:function(e){return void 0===e},represent:function(){return""}})},{"../../type":13}],21:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:map",{kind:"mapping",construct:function(e){return null!==e?e:{}}})},{"../type":13}],22:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:merge",{kind:"scalar",resolve:function(e){return"<<"===e||null===e}})},{"../type":13}],23:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:null",{kind:"scalar",resolve:function(e){if(null===e)return!0;var t=e.length;return 1===t&&"~"===e||4===t&&("null"===e||"Null"===e||"NULL"===e)},construct:function(){return null},predicate:function(e){return null===e},represent:{canonical:function(){return"~"},lowercase:function(){return"null"},uppercase:function(){return"NULL"},camelcase:function(){return"Null"}},defaultStyle:"lowercase"})},{"../type":13}],24:[function(e,t,n){"use strict";var i=e("../type"),c=Object.prototype.hasOwnProperty,u=Object.prototype.toString;t.exports=new i("tag:yaml.org,2002:omap",{kind:"sequence",resolve:function(e){if(null===e)return!0;var t,n,i,r,o,a=[],s=e;for(t=0,n=s.length;t<n;t+=1){if(i=s[t],o=!1,"[object Object]"!==u.call(i))return!1;for(r in i)if(c.call(i,r)){if(o)return!1;o=!0}if(!o)return!1;if(-1!==a.indexOf(r))return!1;a.push(r)}return!0},construct:function(e){return null!==e?e:[]}})},{"../type":13}],25:[function(e,t,n){"use strict";var i=e("../type"),s=Object.prototype.toString;t.exports=new i("tag:yaml.org,2002:pairs",{kind:"sequence",resolve:function(e){if(null===e)return!0;var t,n,i,r,o,a=e;for(o=new Array(a.length),t=0,n=a.length;t<n;t+=1){if(i=a[t],"[object Object]"!==s.call(i))return!1;if(1!==(r=Object.keys(i)).length)return!1;o[t]=[r[0],i[r[0]]]}return!0},construct:function(e){if(null===e)return[];var t,n,i,r,o,a=e;for(o=new Array(a.length),t=0,n=a.length;t<n;t+=1)i=a[t],r=Object.keys(i),o[t]=[r[0],i[r[0]]];return o}})},{"../type":13}],26:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:seq",{kind:"sequence",construct:function(e){return null!==e?e:[]}})},{"../type":13}],27:[function(e,t,n){"use strict";var i=e("../type"),r=Object.prototype.hasOwnProperty;t.exports=new i("tag:yaml.org,2002:set",{kind:"mapping",resolve:function(e){if(null===e)return!0;var t,n=e;for(t in n)if(r.call(n,t)&&null!==n[t])return!1;return!0},construct:function(e){return null!==e?e:{}}})},{"../type":13}],28:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:str",{kind:"scalar",construct:function(e){return null!==e?e:""}})},{"../type":13}],29:[function(e,t,n){"use strict";var i=e("../type"),p=new RegExp("^([0-9][0-9][0-9][0-9])-([0-9][0-9])-([0-9][0-9])$"),f=new RegExp("^([0-9][0-9][0-9][0-9])-([0-9][0-9]?)-([0-9][0-9]?)(?:[Tt]|[ \\t]+)([0-9][0-9]?):([0-9][0-9]):([0-9][0-9])(?:\\.([0-9]*))?(?:[ \\t]*(Z|([-+])([0-9][0-9]?)(?::([0-9][0-9]))?))?$");t.exports=new i("tag:yaml.org,2002:timestamp",{kind:"scalar",resolve:function(e){return null!==e&&(null!==p.exec(e)||null!==f.exec(e))},construct:function(e){var t,n,i,r,o,a,s,c,u=0,l=null;if(null===(t=p.exec(e))&&(t=f.exec(e)),null===t)throw new Error("Date resolve error");if(n=+t[1],i=+t[2]-1,r=+t[3],!t[4])return new Date(Date.UTC(n,i,r));if(o=+t[4],a=+t[5],s=+t[6],t[7]){for(u=t[7].slice(0,3);u.length<3;)u+="0";u=+u}return t[9]&&(l=6e4*(60*+t[10]+ +(t[11]||0)),"-"===t[9]&&(l=-l)),c=new Date(Date.UTC(n,i,r,o,a,s,u)),l&&c.setTime(c.getTime()-l),c},instanceOf:Date,represent:function(e){return e.toISOString()}})},{"../type":13}],"/":[function(e,t,n){"use strict";var i=e("./lib/js-yaml.js");t.exports=i},{"./lib/js-yaml.js":1}]},{},[])("/")});
diff --git a/lib/js-yaml/dumper.js b/lib/js-yaml/dumper.js
index 67cf6ca0..86f34794 100644
--- a/lib/js-yaml/dumper.js
+++ b/lib/js-yaml/dumper.js
@@ -105,16 +105,17 @@ function encodeHex(character) {
 }
 
 function State(options) {
-  this.schema       = options['schema'] || DEFAULT_FULL_SCHEMA;
-  this.indent       = Math.max(1, (options['indent'] || 2));
-  this.skipInvalid  = options['skipInvalid'] || false;
-  this.flowLevel    = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
-  this.styleMap     = compileStyleMap(this.schema, options['styles'] || null);
-  this.sortKeys     = options['sortKeys'] || false;
-  this.lineWidth    = options['lineWidth'] || 80;
-  this.noRefs       = options['noRefs'] || false;
-  this.noCompatMode = options['noCompatMode'] || false;
-  this.condenseFlow = options['condenseFlow'] || false;
+  this.schema        = options['schema'] || DEFAULT_FULL_SCHEMA;
+  this.indent        = Math.max(1, (options['indent'] || 2));
+  this.noArrayIndent = options['noArrayIndent'] || false;
+  this.skipInvalid   = options['skipInvalid'] || false;
+  this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys      = options['sortKeys'] || false;
+  this.lineWidth     = options['lineWidth'] || 80;
+  this.noRefs        = options['noRefs'] || false;
+  this.noCompatMode  = options['noCompatMode'] || false;
+  this.condenseFlow  = options['condenseFlow'] || false;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.explicitTypes = this.schema.compiledExplicit;
@@ -734,13 +735,14 @@ function writeNode(state, level, object, block, compact, iskey) {
         }
       }
     } else if (type === '[object Array]') {
+      var arrayLevel = (state.noArrayIndent && (level > 0)) ? level - 1 : level;
       if (block && (state.dump.length !== 0)) {
-        writeBlockSequence(state, level, state.dump, compact);
+        writeBlockSequence(state, arrayLevel, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
         }
       } else {
-        writeFlowSequence(state, level, state.dump);
+        writeFlowSequence(state, arrayLevel, state.dump);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
diff --git a/lib/js-yaml/loader.js b/lib/js-yaml/loader.js
index fe2cb4d0..2815c955 100644
--- a/lib/js-yaml/loader.js
+++ b/lib/js-yaml/loader.js
@@ -30,6 +30,8 @@ var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
 var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
 
 
+function _class(obj) { return Object.prototype.toString.call(obj); }
+
 function is_EOL(c) {
   return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
 }
@@ -285,6 +287,31 @@ function mergeMappings(state, destination, source, overridableKeys) {
 function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, startLine, startPos) {
   var index, quantity;
 
+  // The output is a plain object here, so keys can only be strings.
+  // We need to convert keyNode to a string, but doing so can hang the process
+  // (deeply nested arrays that explode exponentially using aliases).
+  if (Array.isArray(keyNode)) {
+    keyNode = Array.prototype.slice.call(keyNode);
+
+    for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
+      if (Array.isArray(keyNode[index])) {
+        throwError(state, 'nested arrays are not supported inside keys');
+      }
+
+      if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
+        keyNode[index] = '[object Object]';
+      }
+    }
+  }
+
+  // Avoid code execution in load() via toString property
+  // (still use its own toString for arrays, timestamps,
+  // and whatever user schema extensions happen to have @@toStringTag)
+  if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
+    keyNode = '[object Object]';
+  }
+
+
   keyNode = String(keyNode);
 
   if (_result === null) {
diff --git a/package.json b/package.json
index 7d2652c8..4eefe04e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "js-yaml",
-  "version": "3.12.0",
+  "version": "3.13.1",
   "description": "YAML 1.2 parser and serializer",
   "keywords": [
     "yaml",
diff --git a/test/issues/0350.js b/test/issues/0350.js
index 891f99e1..5b3f3da5 100644
--- a/test/issues/0350.js
+++ b/test/issues/0350.js
@@ -6,7 +6,7 @@ var yaml = require('../../');
 var readFileSync = require('fs').readFileSync;
 
 
-test('should allow cast integers as !!float', function () {
+test('should return parse docs from loadAll', function () {
   var data = yaml.safeLoadAll(readFileSync(require('path').join(__dirname, '/0350.yml'), 'utf8'));
 
   assert.deepEqual(data, [ { a: 1 }, { b: 2 } ]);
diff --git a/test/issues/0432.js b/test/issues/0432.js
new file mode 100644
index 00000000..b6cd1620
--- /dev/null
+++ b/test/issues/0432.js
@@ -0,0 +1,18 @@
+'use strict';
+
+
+var assert = require('assert');
+var yaml = require('../../');
+
+
+test('should indent arrays an extra level by default', function () {
+  var output = yaml.safeDump({ array: [ 'a', 'b' ] });
+  var expected = 'array:\n  - a\n  - b\n';
+  assert.strictEqual(output, expected);
+});
+
+test('should not indent arrays an extra level when disabled', function () {
+  var output = yaml.safeDump({ array: [ 'a', 'b' ] }, { noArrayIndent: true });
+  var expected = 'array:\n- a\n- b\n';
+  assert.strictEqual(output, expected);
+});
diff --git a/test/issues/0468.js b/test/issues/0468.js
new file mode 100644
index 00000000..6337c3f1
--- /dev/null
+++ b/test/issues/0468.js
@@ -0,0 +1,29 @@
+'use strict';
+
+
+var assert = require('assert');
+var yaml = require('../..');
+
+test('should not indent arrays an extra level when disabled', function () {
+  /* eslint-disable max-len */
+  var output = yaml.dump(
+    [
+      {
+        a: 'a_val',
+        b: 'b_val'
+      },
+      {
+        a: 'a2_val',
+        items: [
+          {
+            a: 'a_a_val',
+            b: 'a_b_val'
+          }
+        ]
+      }
+    ],
+    { noArrayIndent: true }
+  );
+  var expected = '- a: a_val\n  b: b_val\n- a: a2_val\n  items:\n  - a: a_a_val\n    b: a_b_val\n';
+  assert.strictEqual(output, expected);
+});
diff --git a/test/issues/0475-case1.yml b/test/issues/0475-case1.yml
new file mode 100644
index 00000000..29e78476
--- /dev/null
+++ b/test/issues/0475-case1.yml
@@ -0,0 +1,117 @@
+? - - &id057
+      - &id055
+        - &id053
+          - &id051
+            - &id049
+              - &id047
+                - &id045
+                  - &id043
+                    - &id041
+                      - &id039
+                        - &id037
+                          - &id035
+                            - &id033
+                              - &id031
+                                - &id029
+                                  - &id027
+                                    - &id025
+                                      - &id023
+                                        - &id021
+                                          - &id019
+                                            - &id017
+                                              - &id015
+                                                - &id013
+                                                  - &id011
+                                                    - &id009
+                                                      - &id007
+                                                        - &id005
+                                                          - &id003
+                                                            - &id001 [lol]
+                                                            - &id002 [lol]
+                                                          - &id004
+                                                            - *id001
+                                                            - *id002
+                                                        - &id006
+                                                          - *id003
+                                                          - *id004
+                                                      - &id008
+                                                        - *id005
+                                                        - *id006
+                                                    - &id010
+                                                      - *id007
+                                                      - *id008
+                                                  - &id012
+                                                    - *id009
+                                                    - *id010
+                                                - &id014
+                                                  - *id011
+                                                  - *id012
+                                              - &id016
+                                                - *id013
+                                                - *id014
+                                            - &id018
+                                              - *id015
+                                              - *id016
+                                          - &id020
+                                            - *id017
+                                            - *id018
+                                        - &id022
+                                          - *id019
+                                          - *id020
+                                      - &id024
+                                        - *id021
+                                        - *id022
+                                    - &id026
+                                      - *id023
+                                      - *id024
+                                  - &id028
+                                    - *id025
+                                    - *id026
+                                - &id030
+                                  - *id027
+                                  - *id028
+                              - &id032
+                                - *id029
+                                - *id030
+                            - &id034
+                              - *id031
+                              - *id032
+                          - &id036
+                            - *id033
+                            - *id034
+                        - &id038
+                          - *id035
+                          - *id036
+                      - &id040
+                        - *id037
+                        - *id038
+                    - &id042
+                      - *id039
+                      - *id040
+                  - &id044
+                    - *id041
+                    - *id042
+                - &id046
+                  - *id043
+                  - *id044
+              - &id048
+                - *id045
+                - *id046
+            - &id050
+              - *id047
+              - *id048
+          - &id052
+            - *id049
+            - *id050
+        - &id054
+          - *id051
+          - *id052
+      - &id056
+        - *id053
+        - *id054
+    - &id058
+      - *id055
+      - *id056
+  - - *id057
+    - *id058
+: key
diff --git a/test/issues/0475-case2.yml b/test/issues/0475-case2.yml
new file mode 100644
index 00000000..f5c69b53
--- /dev/null
+++ b/test/issues/0475-case2.yml
@@ -0,0 +1,112 @@
+ - &id057
+   - &id055
+     - &id053
+       - &id051
+         - &id049
+           - &id047
+             - &id045
+               - &id043
+                 - &id041
+                   - &id039
+                     - &id037
+                       - &id035
+                         - &id033
+                           - &id031
+                             - &id029
+                               - &id027
+                                 - &id025
+                                   - &id023
+                                     - &id021
+                                       - &id019
+                                         - &id017
+                                           - &id015
+                                             - &id013
+                                               - &id011
+                                                 - &id009
+                                                   - &id007
+                                                     - &id005
+                                                       - &id003
+                                                         - &id001 [lol]
+                                                         - &id002 [lol]
+                                                       - &id004
+                                                         - *id001
+                                                         - *id002
+                                                     - &id006
+                                                       - *id003
+                                                       - *id004
+                                                   - &id008
+                                                     - *id005
+                                                     - *id006
+                                                 - &id010
+                                                   - *id007
+                                                   - *id008
+                                               - &id012
+                                                 - *id009
+                                                 - *id010
+                                             - &id014
+                                               - *id011
+                                               - *id012
+                                           - &id016
+                                             - *id013
+                                             - *id014
+                                         - &id018
+                                           - *id015
+                                           - *id016
+                                       - &id020
+                                         - *id017
+                                         - *id018
+                                     - &id022
+                                       - *id019
+                                       - *id020
+                                   - &id024
+                                     - *id021
+                                     - *id022
+                                 - &id026
+                                   - *id023
+                                   - *id024
+                               - &id028
+                                 - *id025
+                                 - *id026
+                             - &id030
+                               - *id027
+                               - *id028
+                           - &id032
+                             - *id029
+                             - *id030
+                         - &id034
+                           - *id031
+                           - *id032
+                       - &id036
+                         - *id033
+                         - *id034
+                     - &id038
+                       - *id035
+                       - *id036
+                   - &id040
+                     - *id037
+                     - *id038
+                 - &id042
+                   - *id039
+                   - *id040
+               - &id044
+                 - *id041
+                 - *id042
+             - &id046
+               - *id043
+               - *id044
+           - &id048
+             - *id045
+             - *id046
+         - &id050
+           - *id047
+           - *id048
+       - &id052
+         - *id049
+         - *id050
+     - &id054
+       - *id051
+       - *id052
+   - &id056
+     - *id053
+     - *id054
+ - *id057 : 1
diff --git a/test/issues/0475.js b/test/issues/0475.js
new file mode 100644
index 00000000..3727560a
--- /dev/null
+++ b/test/issues/0475.js
@@ -0,0 +1,27 @@
+'use strict';
+
+
+var assert = require('assert');
+var yaml   = require('../../');
+var readFileSync = require('fs').readFileSync;
+
+
+test('Should not allow nested arrays in map keys (explicit syntax)', function () {
+  try {
+    yaml.safeLoad(readFileSync(require('path').join(__dirname, '/0475-case1.yml'), 'utf8'));
+  } catch (err) {
+    assert(err.stack.startsWith('YAMLException: nested arrays are not supported inside keys'));
+    return;
+  }
+  assert.fail(null, null, 'Expected an error to be thrown');
+});
+
+test('Should not allow nested arrays in map keys (implicit syntax)', function () {
+  try {
+    yaml.safeLoad(readFileSync(require('path').join(__dirname, '/0475-case2.yml'), 'utf8'));
+  } catch (err) {
+    assert(err.stack.startsWith('YAMLException: nested arrays are not supported inside keys'));
+    return;
+  }
+  assert.fail(null, null, 'Expected an error to be thrown');
+});
diff --git a/test/issues/0480-date.yml b/test/issues/0480-date.yml
new file mode 100644
index 00000000..3fcac6e0
--- /dev/null
+++ b/test/issues/0480-date.yml
@@ -0,0 +1 @@
+{ !<tag:yaml.org,2002:timestamp> '2019-04-05T12:00:43.467Z': 123 }
diff --git a/test/issues/0480-fn-array.yml b/test/issues/0480-fn-array.yml
new file mode 100644
index 00000000..2e151bf5
--- /dev/null
+++ b/test/issues/0480-fn-array.yml
@@ -0,0 +1,4 @@
+? [
+    123,
+    { toString: !<tag:yaml.org,2002:js/function> 'function (){throw new Error("code execution")}' }
+] : key
diff --git a/test/issues/0480-fn.yml b/test/issues/0480-fn.yml
new file mode 100644
index 00000000..68412be5
--- /dev/null
+++ b/test/issues/0480-fn.yml
@@ -0,0 +1 @@
+{ toString: !<tag:yaml.org,2002:js/function> 'function (){throw new Error("code execution")}' } : key
diff --git a/test/issues/0480-fn2.yml b/test/issues/0480-fn2.yml
new file mode 100644
index 00000000..6efd250d
--- /dev/null
+++ b/test/issues/0480-fn2.yml
@@ -0,0 +1 @@
+{ __proto__: { toString: !<tag:yaml.org,2002:js/function> 'function(){throw new Error("code execution")}' } } : key
diff --git a/test/issues/0480.js b/test/issues/0480.js
new file mode 100644
index 00000000..bd9f4180
--- /dev/null
+++ b/test/issues/0480.js
@@ -0,0 +1,34 @@
+'use strict';
+
+
+var assert = require('assert');
+var yaml   = require('../../');
+var readFileSync = require('fs').readFileSync;
+
+
+test('Should not execute code when object with toString property is used as a key', function () {
+  var data = yaml.load(readFileSync(require('path').join(__dirname, '/0480-fn.yml'), 'utf8'));
+
+  assert.deepEqual(data, { '[object Object]': 'key' });
+});
+
+test('Should not execute code when object with __proto__ property is used as a key', function () {
+  var data = yaml.load(readFileSync(require('path').join(__dirname, '/0480-fn2.yml'), 'utf8'));
+
+  assert.deepEqual(data, { '[object Object]': 'key' });
+});
+
+test('Should not execute code when object inside array is used as a key', function () {
+  var data = yaml.load(readFileSync(require('path').join(__dirname, '/0480-fn-array.yml'), 'utf8'));
+
+  assert.deepEqual(data, { '123,[object Object]': 'key' });
+});
+
+// this test does not guarantee in any way proper handling of date objects,
+// it just keeps old behavior whenever possible
+test('Should leave non-plain objects as is', function () {
+  var data = yaml.load(readFileSync(require('path').join(__dirname, '/0480-date.yml'), 'utf8'));
+
+  assert.deepEqual(Object.keys(data).length, 1);
+  assert(/2019/.test(Object.keys(data)[0]));
+});
diff --git a/test/mocha.opts b/test/mocha.opts
index 5efaf24d..a8f4aff7 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1 +1,2 @@
 --ui tdd
+--timeout 10000