[wp-trac] [WordPress Trac] #49421: Cannot use conversion specifications in `theme mod` default values

[WordPress Trac]

#49421: Cannot use conversion specifications in `theme mod` default values
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 Reporter:  jqz           |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Future Release
Component:  Customize     |     Version:  5.3
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by jqz):

 Replying to [comment:3 mikeschroder]:
 > @SergeyBiryukov, since you committed/worked on the last patch, do you
 have any thoughts on the best way forward?

 I can't speak for Sergey, but thinking about this, I would suggest the
 solution to the original problem (#34290) would be to simply document the
 behaviour - i.e. to get a literal `%` in the default value it must be
 escaped as `%%`.

 I don't see (or indeed think there is) any other solution which retains
 support for the URL insertion without a BC.  Moreover, removing URL
 insertion support would be a BC even for implementations which don't use
 it, if they are ('correctly') escaping their `%`s.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49421#comment:6>
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