unicode: use unicode.ToUpper on the result of unicode.ToLower returns the wrong rune if it is a Greek rune: ẞ and ϴ #56448
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NeedsInvestigation
Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
What version of Go are you using (
go version
)?Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (
go env
)?go env
OutputWhat did you do?
go.dev/play/p/ALKvDC3qbov
What did you expect to see?
Using
unicode.ToUpper
on the result ofunicode.ToLower
would result in the same rune for the greek runes: ẞ and ϴ.What did you see instead?
The lowercase variant is being used in lieu of the uppercase variant
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