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rOACCT/node_modules/core-js/modules/esnext.map.group-by.js
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esnext.map.group-by.js
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			'use strict';
			var $ = require('../internals/export');
			var call = require('../internals/function-call');
			var uncurryThis = require('../internals/function-uncurry-this');
			var isCallable = require('../internals/is-callable');
			var aCallable = require('../internals/a-callable');
			var iterate = require('../internals/iterate');
			var Map = require('../internals/map-helpers').Map;

			var push = uncurryThis([].push);

			// `Map.groupBy` method
			// https://github.com/tc39/proposal-collection-methods
			$({ target: 'Map', stat: true, forced: true }, {
			groupBy: function groupBy(iterable, keyDerivative) {
			var C = isCallable(this) ? this : Map;
			var newMap = new C();
			aCallable(keyDerivative);
			var has = aCallable(newMap.has);
			var get = aCallable(newMap.get);
			var set = aCallable(newMap.set);
			iterate(iterable, function (element) {
			var derivedKey = keyDerivative(element);
			if (!call(has, newMap, derivedKey)) call(set, newMap, derivedKey, [element]);
			else push(call(get, newMap, derivedKey), element);
			});
			return newMap;
			}
			});