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According to the documentation at http://msdn.microsoft.com/en-us/library/dh0797c4.aspx, System.Text.Encoder throws ArgumentOutOfRangeExceptions when it should not. From the documentation, an ArgumentOutOfRangeException should be thrown when:
charIndex, charCount, byteIndex, or byteCount is less than zero.
The length of chars - charIndex is less than charCount.
The length of bytes - byteIndex is less than byteCount.
To reproduce, run the following code:
int charsUsed, bytesUsed;
byte  bytes = new byte ;
Encoding.UTF8.GetEncoder ().Convert (new char, 0, 0, bytes, 0, bytes.Length, true, out charsUsed, out bytesUsed, out completed);
The code runs, charsUsed equals zero, bytesUsed equals zero and completed is true.
Mono throws an ArgumentOutOfRangeException for charIndex.
Submitted pull request with fix, https://github.com/mono/mono/pull/419