Function range

src/compute-engine/library/collections.ts:2658–2676

(
  expr: Expression
)

      if (a.nops !== b.nops) return false;
      // The elements are not indexed
      const has: (x: Expression) => boolean = (x) =>
        b.ops.some((y) => x.isSame(y));
      return a.ops.every(has);
    },
    collection: {
      ...SET_BASE_HANDLERS,
      // A set is not indexable
      at: undefined,
      indexWhere: undefined,
      // A comprehension computes its elements on demand
      isLazy: (expr) =>
        isFunction(expr) && parseSetComprehension(expr.ops) !== null,
      count: (expr) => {
        if (!isFunction(expr)) return 0;
        const comp = parseSetComprehension(expr.ops);
        if (comp === null) return expr.nops;
        // Cardinality of the comprehension: number of distinct substituted
        // bodies. Symbolic or infinite domains are not enumerable: undefined.
        return enumerateSetComprehension(comp)?.length;
      },
      isEmpty: (expr) => {
        if (!isFunction(expr)) return true;