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rOACCT/node_modules/core-js/modules/esnext.reflect.get-metadata-keys.js
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esnext.reflect.get-metadata-keys.js
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			// TODO: Remove from `core-js@4`
			var $ = require('../internals/export');
			var uncurryThis = require('../internals/function-uncurry-this');
			var ReflectMetadataModule = require('../internals/reflect-metadata');
			var anObject = require('../internals/an-object');
			var getPrototypeOf = require('../internals/object-get-prototype-of');
			var $arrayUniqueBy = require('../internals/array-unique-by');

			var arrayUniqueBy = uncurryThis($arrayUniqueBy);
			var concat = uncurryThis([].concat);
			var ordinaryOwnMetadataKeys = ReflectMetadataModule.keys;
			var toMetadataKey = ReflectMetadataModule.toKey;

			var ordinaryMetadataKeys = function (O, P) {
			var oKeys = ordinaryOwnMetadataKeys(O, P);
			var parent = getPrototypeOf(O);
			if (parent === null) return oKeys;
			var pKeys = ordinaryMetadataKeys(parent, P);
			return pKeys.length ? oKeys.length ? arrayUniqueBy(concat(oKeys, pKeys)) : pKeys : oKeys;
			};

			// `Reflect.getMetadataKeys` method
			// https://github.com/rbuckton/reflect-metadata
			$({ target: 'Reflect', stat: true }, {
			getMetadataKeys: function getMetadataKeys(target /* , targetKey */) {
			var targetKey = arguments.length < 2 ? undefined : toMetadataKey(arguments[1]);
			return ordinaryMetadataKeys(anObject(target), targetKey);
			}
			});