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rOACCT/node_modules/core-js/internals/composite-key.js
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composite-key.js
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			// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
			require('../modules/es.map');
			require('../modules/es.weak-map');
			var getBuiltIn = require('../internals/get-built-in');
			var create = require('../internals/object-create');
			var isObject = require('../internals/is-object');

			var $Object = Object;
			var $TypeError = TypeError;
			var Map = getBuiltIn('Map');
			var WeakMap = getBuiltIn('WeakMap');

			var Node = function () {
			// keys
			this.object = null;
			this.symbol = null;
			// child nodes
			this.primitives = null;
			this.objectsByIndex = create(null);
			};

			Node.prototype.get = function (key, initializer) {
			return this[key] \|\| (this[key] = initializer());
			};

			Node.prototype.next = function (i, it, IS_OBJECT) {
			var store = IS_OBJECT
			? this.objectsByIndex[i] \|\| (this.objectsByIndex[i] = new WeakMap())
			: this.primitives \|\| (this.primitives = new Map());
			var entry = store.get(it);
			if (!entry) store.set(it, entry = new Node());
			return entry;
			};

			var root = new Node();

			module.exports = function () {
			var active = root;
			var length = arguments.length;
			var i, it;
			// for prevent leaking, start from objects
			for (i = 0; i < length; i++) {
			if (isObject(it = arguments[i])) active = active.next(i, it, true);
			}
			if (this === $Object && active === root) throw $TypeError('Composite keys must contain a non-primitive component');
			for (i = 0; i < length; i++) {
			if (!isObject(it = arguments[i])) active = active.next(i, it, false);
			} return active;
			};