poly_send(PG_FUNCTION_ARGS)
{
	POLYGON    *poly = PG_GETARG_POLYGON_P(0);
	StringInfoData buf;
	int32		i;

	pq_begintypsend(&buf);
	pq_sendint(&buf, poly->npts, sizeof(int32));
	for (i = 0; i < poly->npts; i++)
	{
		pq_sendfloat8(&buf, poly->p[i].x);
		pq_sendfloat8(&buf, poly->p[i].y);
	}
	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

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