One function missing in Data.Map

Isn't the function adjustLookupWithKey missing in Data.Map? There are functions ending in LookupWithKey for both insert and update but not for adjust.

adjustLookupWithKey :: Ord k => (k -> a -> Maybe a) -> k -> Map k a -> (Maybe a, Map k a)

adjustLookupWithKey f k m[[BR]]

==> (Nothing, m) if k is not in m[[BR]] ==> (Just old, m) if f x is Nothing[[BR]] ==> (Just new, m') if f x is Just new, and m' being m adjusted

The same behavior could be simulated using library function and user defined function, but I it deserves an implementation.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
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