is_decimal: Fix an integer underflow. #145
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It seems harmless though. Found by UBSAN parson.c:270:18: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long')
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It seems harmless though.
Found by UBSAN
parson.c:270:18: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long')