hstore_ne(PG_FUNCTION_ARGS)
{
	int			res = DatumGetInt32(DirectFunctionCall2(hstore_cmp,
														PG_GETARG_DATUM(0),
														PG_GETARG_DATUM(1)));

	PG_RETURN_BOOL(res != 0);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.