Warns when muted props are passed.

src/renderers/shared/reconciler/ReactCompositeComponent.js

@@ -147,6 +147,7 @@ var ReactCompositeComponentMixin = {
     // Initialize the public class
     var inst;
     var renderedElement;
+    var propsMuted = false;
 
     // This is a way to detect if Component is a stateless arrow function
     // component, which is not newable. It might not be 100% reliable but is
@@ -195,6 +196,32 @@ var ReactCompositeComponentMixin = {
           Component.displayName || Component.name || 'Component'
         );
       }
+
+      propsMuted = (function(instProps, pubProps) {
+        var instPropsKeys, pubPropsKeys, arePropsMuted, prop, i, ii;
+        instPropsKeys = Object.keys(instProps || {});
+        pubPropsKeys = Object.keys(pubProps);
+        arePropsMuted = false;
+        if (instPropsKeys.length !== pubPropsKeys.length) {
+          arePropsMuted = true;
+        }
+        for (i = 0, ii = instPropsKeys.length; i < ii; i += 1) {
+          prop = instPropsKeys[i];
+          if (instProps[prop] !== pubProps[prop]) {
+            arePropsMuted = true;
+            break;
+          }
+        }
+        return arePropsMuted;
+      }(inst.props, publicProps));
+
+      if (!propsMuted) {
+        warning(
+          !propsMuted,
+          'Muted props not allowed in %s(...)',
+          Component.displayName || Component.name || 'Component'
+        );
+      }
     }
 
     // These should be set up in the constructor, but as a convenience for