[9.x] Remove useless reduceWithKeys method
#40566
Merged
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The original introduction of
reduceWithKeyswas kind of not ideal for two reasons: the name is inconsistent with the other*WithKeysmethod, and it really should've never been a separate method -reduceitself could handle keys too....and that's what we ultimately did: we added
$keysupport to the regularreducemethod.We decided to keep
reduceWithKeysin 8.x, and then remove it completely in 9.x. I think #35901 was trying to do that, but evidently it's still around. So this PR removes it.