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7fe60ff8c3
align with the behavior of pdfbox and c implementations where single character final blocks are ignored rather than being written. also makes the error more informative in case it is ever encountered again. add more test cases. it is possible this is hiding the problem and will move the error elsewhere but this matches the implementation behavior of the 2 reference implementations. one other potential source for the error is if pdf supports '<~' as a start of data marker which i can't find in the spec but wikipedia says might be possible? without documents to trigger the error i think this is the best fix for now