[wp-trac] [WordPress Trac] #58141: `wp_post_insert` considers `"0"` as empty content.

[WordPress Trac]

#58141: `wp_post_insert` considers `"0"` as empty content.
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 Reporter:  peterwilsoncc      |      Owner:  (none)
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Posts, Post Types  |    Version:  3.3
 Severity:  normal             |   Keywords:
  Focuses:                     |
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 The `wp_insert_post` function includes a check to prevent the publishing
 of empty posts. A post is considered empty if the title, excerpt and
 content are undefined on post types that support all three items.
 [https://core.trac.wordpress.org/browser/tags/6.2/src/wp-
 includes/post.php?marks=4115-4119#L4115 See code reference].

 As the code currently uses loose comparisons, the string `"0"` is
 considered empty content, to reproduce:

 1. Create a new post
 2. Switch to code editing view
 3. Set the title to `0`
 4. Set the content to `0`
 5. Attempt to publish the post
 6. WordPress with throw an error: Publishing failed. Content, title and
 excerpt are empty.

 See the attached screen shot.

 While `0` isn't great content, it is content so WordPress should allow the
 publishing of articles with this. Converting the tests to strict checks
 against an empty string should resolve the issue.

 Props due: @cybr following discussion in
 [https://wordpress.slack.com/archives/C02RQBWTW/p1681682924744069 Slack].

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Ticket URL: <https://core.trac.wordpress.org/ticket/58141>
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