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According to MSDN docs for the overload string.Split (string, ...):
"The Split method looks for delimiters by performing comparisons using case-sensitive ordinal sort rules"
However, Mono's implementation uses string.IndexOf (string, int, int), and according to MSDN docs for this overload:
"This method performs a word (case-sensitive and culture-sensitive) search using the current culture"
Assuming the MSDN docs are correct, Mono's string.Split should probably use the IndexOf overload that accepts a StringComparison specifier, and pass StringComparison.Ordinal.
If they're not correct, we should document this somewhere.
Fixed in master