Mentioned in [54241] on Core SVN:
General: Throw a more descriptive error when templates are not found.

Mentioned in [48369] on Core SVN:
Upload: Introduce `pre_wp_unique_filename_file_list` filter to allow for short-circuiting the `scandir()` call in `wp_unique_filename()`.

Created ticket #49096 on Core Trac:
Allow updating attachments with new files

Mentioned in [46780] on Core SVN:
Options, Meta APIs: Avoid a race condition causing the first of two subsequent requests updating different options at the same time to lose changes.

Mentioned in [46753] on Core SVN:
Options, Meta APIs: Avoid a race condition causing the first of two subsequent requests updating different options at the same time to lose changes.

Mentioned in [45811] on Core SVN:
REST API: Cache results of get_item_schema on controller instances for performance.

Created ticket #47871 on Core Trac:
Cache item schema in REST controllers

Mentioned in [45632] on Core SVN:
REST API: Allow `rest_get_avatar_urls()` to accept full user, post, or comment objects, rather than just an email address, to provide better flexibility for alternative avatar data.

Mentioned in [44107] on Core SVN:
REST API: Introduce controller for searching across post types.

Mentioned in [43741] on Core SVN:
REST API: Fix version number in `_doing_it_wrong()` call.

Mentioned in [43714] on Core SVN:
REST API: Pass correct ID to `meta->update_value` to permit setting term meta during term creation.

Mentioned in [43680] on Core SVN:
REST API: Define taxonomy visibility settings in schema

Mentioned in [43637] on Core SVN:
REST API: Pass correct ID to `meta->update_value` to permit setting term meta during term creation.

Mentioned in [43636] on Core SVN:
REST API: Pass correct ID to `meta->update_value` to permit setting term meta during term creation.

Created ticket #44834 on Core Trac:
Unable to set term meta in create term request

Created ticket #44254 on Core Trac:
Personal Data archives are not deleted / cleaned up

Mentioned in [42729] on Core SVN:
REST API: Show taxonomy visibility settings.

Committed [42359] to Core SVN:
REST API: Include permalink_structure in the settings route. There are ...

Closed ticket #42061 on Core Trac:
Add new utility function for checking if the current request is a REST API ...

Closed ticket #42303 on Core Trac:
REST API: Post status controller has wrong view permission check error ...

Committed [42356] to Core SVN:
REST API: Fix permissions error message in post statuses controller. The ...

Created ticket #42785 on Core Trac:
Change default of `show_in_rest` in register_post_type and ...

Closed ticket #38583 on Core Trac:
Support for objects in schema validation and sanitization

Committed [42000] to Core SVN:
REST API: Don’t remove unregistered properties from objects in schema. In ...

Mentioned in [41758] on Core SVN:
REST API: Support objects in settings schema.

Committed [41727] to Core SVN:
REST API: Support for objects in schema validation and sanitization. When ...

Mentioned in [40600] on Core SVN:
REST API: Allow "Origin: null" from file: URLs.

Closed ticket #39806 on Core Trac:
Disable REST API by default, making it opt-in rather than always-on

Committed [40577] to Core SVN:
REST API: WP_REST_Request::remove_header() should canonicalize header ...

Closed ticket #39185 on Core Trac:
REST API Media end-point, "description" field changes with WP 4.7

Closed ticket #38926 on Core Trac:
REST API: Validate thumbnail ID in response

Closed ticket #37179 on Core Trac:
Add _links to the WP-REST-API JSON index.

Closed ticket #39861 on Core Trac:
WP REST API and Caching Issue

Closed ticket #40251 on Core Trac:
Querying for single user in REST API after unsetting rest_user_query ...

Mentioned in [40115] on Core SVN:
REST API: Shim `post_date_gmt` for drafts / empty dates in the REST API.

Mentioned in [40108] on Core SVN:
REST API: Shim `post_date_gmt` for drafts / empty dates in the REST API.

Created ticket #39704 on Core Trac:
Consider returning pagination headers on out-of-bounds requests

Committed [39991] to Core SVN:
REST API: Fix unit tests for posts out of bounds errors Previously we ...

Closed ticket #39061 on Core Trac:
REST API pagination: Large INT passed to `paged` query arg doesn't fail ...

Committed [39967] to Core SVN:
REST API: Return an error if the page number is out of bounds. Return an ...

Committed [39954] to Core SVN:
REST API: Unify object access handling for simplicity. Rather than ...

Closed ticket #37182 on Core Trac:
Collections are not compatible to HAL standard

Mentioned in [39566] on Core SVN:
REST API: Treat any falsy value as `false` in 'rest_allow_anonymous_comments'.

Mentioned in [39487] on Core SVN:
REST API: Treat any falsy value as `false` in 'rest_allow_anonymous_comments'.