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String.StartsWith() and possibly other methods returns the wrong result when the argument string contains certain unicode characters.
$ mono --version
Mono JIT compiler version 2.10.5 (tarball Mon Sep 5 20:45:01 UTC 2011)
csharp> "d.a".StartsWith("d.\u07B0", StringComparison.Ordinal);
csharp> "d.a".StartsWith("d.\u07B1", StringComparison.Ordinal);
csharp> "d.a".StartsWith("d.\u07B1", StringComparison.OrdinalIgnoreCase);
csharp> "d.".StartsWith("d.\u1701", StringComparison.Ordinal);
This issue seems to be fixed in master