Function compare

src/compute-engine/fungrim/loader.ts:246–253

(v: Expression, b: Expression)

      case 'cmp': {
        const bound = boxGuardExpr(g.bound);
        const compare = (v: Expression, b: Expression): boolean | undefined =>
          g.op === 'gt'
            ? v.isGreater(b)
            : g.op === 'ge'
              ? v.isGreaterEqual(b)
              : g.op === 'lt'
                ? v.isLess(b)
                : v.isLessEqual(b);
        return (sub) => {
          const v = sub[g.wc];
          if (v === undefined) return false;