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According to the MSDN documentation on the CompareInfo.Compare() method, ignorable characters should be recognized during comparison when CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase is specified. Mono behaves differently and ignores ignorable characters even when CompareOptions.Ordinal or CompareOptions.OrdinalIgnoreCase is specified. This also seems to affect other methods that depend on CompareInfo.Compare(), such as String.StartsWith(), String.EndsWith(), etc.
Suggested fix in https://github.com/mono/mono/pull/2544