CultureName "c" and "C" get mapped to Invariant Culture

[adamsitnik]

Fuzzer has helped me to learn one more thing about culture name mappings:

runtime/src/libraries/System.Private.CoreLib/src/System/Globalization/CultureData.cs

Lines 800 to 806 in 37e4d45

	if (cultureName.Length == 1 && (cultureName[0] == 'C' || cultureName[0] == 'c'))
	{
	// Always map the "C" locale to Invariant to avoid mapping it to en_US_POSIX on Linux because POSIX
	// locale collation doesn't support case insensitive comparisons.
	// We do the same mapping on Windows for the sake of consistency.
	return Invariant;
	}

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

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[adamsitnik]

@MihuBot fuzz AssemblyNameInfo

[adamsitnik]

/ba-g the built has started two days ago and have not finished, it's unrelated