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Add a changelog entry for PR-12199 #12420

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@philderbeast

What is wrong with the docs?
#12199 changed the public API of Cabal but didn't include a changelog entry. Please add one.

Comparing the signatures from the rendered haddocks of Cabal-3.18.1.0 Distribution.Simple.Command with the one built locally from 0b16f4f:

- OptArg Description OptFlags ArgPlaceHolder (ReadE (a -> a)) (String, a -> a) (a -> [Maybe String])
+ OptArg Description OptFlags ArgPlaceHolder (ReadE (a -> a)) (a -> a) (a -> [Maybe String]
- optArg :: Monoid b => ArgPlaceHolder -> ReadE b -> (String, b) -> (b -> [Maybe String]) -> MkOptDescr (a -> b) (b -> a -> a) a
+ optArg :: Monoid b => ArgPlaceHolder -> ReadE b -> b -> (b -> [Maybe String]) -> MkOptDescr (a -> b) (b -> a -> a) a
- optArgDef' :: Monoid b => ArgPlaceHolder -> (String, Maybe String -> b) -> (b -> [Maybe String]) -> MkOptDescr (a -> b) (b -> a -> a) a

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  1. philderbeast commented on Oct 8, 2026

    @philderbeast
    CollaboratorAuthor

    I found this rebasing #12213 and hitting a compilation error.

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