If a validation_callback returns a WP_Error it should give the same response format as if it returned `false`. This makes programmatically reading the validation errors better.
Props bradyvercher for initial patch.
Fixes#35028.
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Baby API was born at 2.8KLOC on October 8th at 2:30 UTC. API has lots
of growing to do, so wish it the best of luck.
Thanks to everyone who helped along the way:
Props rmccue, rachelbaker, danielbachhuber, joehoyle, drewapicture,
adamsilverstein, netweb, tlovett1, shelob9, kadamwhite, pento,
westonruter, nikv, tobych, redsweater, alecuf, pollyplummer, hurtige,
bpetty, oso96_2000, ericlewis, wonderboymusic, joshkadis, mordauk,
jdgrimes, johnbillion, jeremyfelt, thiago-negri, jdolan, pkevan,
iseulde, thenbrent, maxcutler, kwight, markoheijnen, phh, natewr,
jjeaton, shprink, mattheu, quasel, jmusal, codebykat, hubdotcom,
tapsboy, QWp6t, pushred, jaredcobb, justinsainton, japh, matrixik,
jorbin, frozzare, codfish, michael-arestad, kellbot, ironpaperweight,
simonlampen, alisspers, eliorivero, davidbhayes, JohnDittmar, dimadin,
traversal, cmmarslender, Toddses, kokarn, welcher, and ericpedia.
Fixes#33982.
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Joe Hoyle
Ryan McCue
Dominik Schilling