Merge branch 'jonsneyers-patch-1'

* jonsneyers-patch-1:
  Clarify support for provisional types like jxl
  Add JPEG XL (image/jxl)

Contributing.md

@@ -73,12 +73,17 @@ $ rake mime:apache
 ##### A Note on Provisional Types
 
 The file `types/provisional-standard-types.yaml` contains the provisionally
-registered types from IANA. Whenever IANA types are updated, the existing
-provisional types should be reviewed in the event that they have been promoted
-to standard types.
+registered types from IANA. Per IANA,
 
-It is recommended that customization _not_ be made to provisional types; the
-provisional types file is rewritten on update.
+> This registry, unlike some other provisional IANA registries, is only for
+> temporary use. Entries in this registry are either finalized and moved to the
+> main media types registry or are abandoned and deleted. Entries in this
+> registry are suitable for use for development and test purposes only.
+
+The provisional types file is rewritten when updated, so pull requests to
+manually promote or customize provisional types (such as with extensions). It is
+recommended that any updates required to the data be performed in your
+application if you require provisional types.
 
 ### Development Dependencies
 
@@ -208,6 +213,7 @@ Thanks to everyone else who has contributed to mime-types:
 - Henrik Hodne
 - Jeremy Evans
 - John Gardner
+- Jon Sneyers
 - Jonas Petersen
 - Juanito Fatas
 - Keerthi Siva

History.md

@@ -10,7 +10,8 @@
   have been ported from the [mini_mime] repository. [#47]
 
 - Added IANA provisional media registries. Added some notes to Contributing.md
-  about the transient nature of the provisional registration data. [#45]
+  about the transient nature of the provisional registration data. This was
+  triggered in part by a pull request by Jon Sneyers. Thanks! [#45], [#43]
 
 ## 3.2021.0901 / 2021-09-01
 
@@ -484,6 +485,7 @@
 [#35]: https://github.com/mime-types/mime-types-data/pull/35
 [#36]: https://github.com/mime-types/mime-types-data/pull/36
 [#40]: https://github.com/mime-types/mime-types-data/pull/40
+[#43]: https://github.com/mime-types/mime-types-data/pull/43
 [#45]: https://github.com/mime-types/mime-types-data/pull/45
 [#46]: https://github.com/mime-types/mime-types-data/pull/46
 [#47]: https://github.com/mime-types/mime-types-data/pull/47

types/provisional-standard-types.yaml

@@ -114,6 +114,8 @@
 - !ruby/object:MIME::Type
   content-type: image/jxl
   encoding: base64
+  extensions:
+  - jxl
   xrefs:
     person:
     - Touradj_Ebrahimi