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'\u4000\f'.TrimEnd(new char[0]) is equal to '\u4000'.
I am passing an empty array, so according to the MSDN documentation nothing should be removed and '\u4000\f' should be returned. Is there a reason for this behaviour?
EDIT: Clarified expected behaviour
EDIT: Apparently, this changed in 3.5, I was looking at the 2.0 documentation page.
the documentation says ‘If trimChars is null (Nothing in Visual Basic) or an empty array, white-space characters are removed instead. ‘
So no, not a bug.