| A | ↘ | B | WPCOM_REST_API_V2_Endpoint_External_Media got worse |
| ⇢ | B | Error_Handler::track_lost_active_master_user() added | |
| ⇢ | A | WPCOM_REST_API_V2_Endpoint_External_Media::delete_... added | |
| B | ↗ | A | Actions::do_initial_sync() improved |
| A | ↘ | B | Error_Handler::wp_error_to_array() got worse |