[wp-trac] [WordPress Trac] #59766: Custom post type archive URLs are being resolved in an unexpected way if a page with the same slug exists and the URL's casing doesn't exactly match the custom post type's rewrite slug

[WordPress Trac]

#59766: Custom post type archive URLs are being resolved in an unexpected way if a
page with the same slug exists and the URL's casing doesn't exactly match
the custom post type's rewrite slug
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 Reporter:  nonverbla          |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Posts, Post Types  |     Version:  6.3.2
 Severity:  normal             |  Resolution:
 Keywords:  has-patch          |     Focuses:
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Comment (by nonverbla):

 So, I just learned about WordPress' policy of never introducing breaking
 changes. Then maybe there is another way to help people to "do it right"
 and save them the trouble I went through to find this?

 How about introducing a hint on all appropriate docs pages
 (`register_post_type` , `register_taxonomy` , `add_rewrite_endpoint`,
 `add_rewrite_rule`, ... come to mind)?  Something like:

 "Please prefer all-lowercase words for your archive and rewrite slugs."
 "Please prefer all-lowercase words when registering custom rewrite rules."
 "..."

 Or even some kind of `doing_it_wrong` warning that is being logged if
 rewrite rules containing uppercase letters are detected and `WP_DEBUG` is
 `true`? This "feature" was causing me a few very stressful moments when it
 was randomly popping up a while back on a client's website.

 It was also very hard to debug, since I never had the idea to actually try
 the URL with capital letters in my manual tests. In the end, I only found
 it by writing a custom logger that would send me an email when the
 response for the URL was looking wrong...

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Ticket URL: <https://core.trac.wordpress.org/ticket/59766#comment:8>
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