[wp-trac] [WordPress Trac] #55600: Can't save registered post meta field of type string that equals registered default value via REST API

[WordPress Trac]

#55600: Can't save registered post meta field of type string that equals registered
default value via REST API
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 Reporter:  kraftner                  |       Owner:  (none)
     Type:  defect (bug)              |      Status:  reopened
 Priority:  normal                    |   Milestone:  Awaiting Review
Component:  Options, Meta APIs        |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  rest-api
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Comment (by dmsnell):

 In my opinion it's not necessary to fix the behavior for single values
 ''and'' for multiple values for the patch to be valuable. if we're having
 a difficult time getting the test to run for multi-value updates, let's
 focus on solving the single-value case and then follow-up with a fix for
 the multi-value cases.

 @kraftner - I know that you mentioned confirming a full rubric of expected
 behaviors. For posterity sake, could you add that here? A simple table
 showing the ways that the direct PHP function and the REST API behave
 differently could quickly summarize the core of this issue, as well as
 clarify what a fix ''ought'' to do.

 Also, please reach out any time for help pushing this forward. I don't
 want to let this linger in limbo, but I can get distracted easily, so it's
 not a bother for you to ping me here or in Slack.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55600#comment:9>
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