Fix positive PyInt converted to negative BigInteger
#1993
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BigInteger constructor uses the sign bit in the first byte. Since we explicitly handle the sign, the fix is to prepend a zero byte to the number, which does not change it, but ensures sign bit is zero. fixes pythonnet#1990
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What does this implement/fix? Explain your changes.
BigInteger(byte[])constructor uses the sign bit in the first byte.Since we handle the sign separately, the fix is to prepend a zero byte to the number, which does not change it, but ensures sign bit is zero.
Does this close any currently open issues?
fixes #1990
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