Remove duplicate alter implementation#1210
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This is only used in an alterF rewrite rule. Update the rule to use alter instead. Benchmarks with GHC 9.14 show minor improvements except for the "absent" case which becomes slower. This case is already documented to be slow in the alterF Haddocks.
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This is only used in an alterF rewrite rule. Update the rule to use alter instead.
Benchmarks with GHC 9.14 show minor improvements except for the "absent" case which becomes slower. This case is already documented to be slow in the alterF Haddocks.
For #1209.