Function merge

src/interpreter/primitive-props.ts:324–342

(left: Value[], right: Value[], comp: VFn)

				return merge(left, right, comp);
			};
			const merge = async (left: Value[], right: Value[], comp: VFn): Promise<Value[]> => {
				const result: Value[] = [];
				let leftIndex = 0;
				let rightIndex = 0;
				while (leftIndex < left.length && rightIndex < right.length) {
					const l = left[leftIndex]!;
					const r = right[rightIndex]!;
					const compValue = await opts.call(comp, [l, r]);
					assertNumber(compValue);
					if (compValue.value <= 0) {
						result.push(left[leftIndex]!);
						leftIndex++;
					} else {
						result.push(right[rightIndex]!);
						rightIndex++;
					}
				}
				return result.concat(left.slice(leftIndex)).concat(right.slice(rightIndex));
			};

			assertFunction(comp);
			assertArray(target);