digit 判定とかもロケールに依存してそう
Char.IsDigit Method (System) | Microsoft Learn
https://learn.microsoft.com/ja-jp/dotnet/api/system.char.isdigit?view=net-8.0#system-char-isdigit(system-char)
> Indicates whether the specified Unicode character is categorized as a decimal digit.
ロケールどころか Unicode カテゴリwww
learn.microsoft.comChar.IsDigit Method (System)Indicates whether a Unicode character is categorized as a decimal digit.
Char.IsAsciiDigit(Char) Method (System) | Microsoft Learn
https://learn.microsoft.com/ja-jp/dotnet/api/system.char.isasciidigit?view=net-8.0
なんだ is ascii digit もあるじゃん、じゃあ許す
learn.microsoft.comChar.IsAsciiDigit(Char) Method (System)Indicates whether a character is categorized as an ASCII digit.