txid_snapshot_xmax(PG_FUNCTION_ARGS)
{
	TxidSnapshot *snap = (TxidSnapshot *) PG_GETARG_VARLENA_P(0);

	PG_RETURN_INT64(snap->xmax);
}

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