New functions added on 2020/07/08:
- filter_default_metadata
- get_metadata_default
- get_metadata_raw
- rest_get_best_type_for_value
- rest_handle_doing_it_wrong
- rest_handle_multi_type_schema
- rest_is_array
- rest_is_integer
- rest_is_object
- rest_sanitize_array
- rest_sanitize_object
- rest_stabilize_value
- rest_validate_array_contains_unique_items
- wp_image_file_matches_image_meta