_hashSet.js
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_hashSet.js
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			var nativeCreate = require('./_nativeCreate');

			/** Used to stand-in for `undefined` hash values. */
			var HASH_UNDEFINED = '__lodash_hash_undefined__';

			/**
			* Sets the hash `key` to `value`.
			*
			* @private
			* @name set
			* @memberOf Hash
			* @param {string} key The key of the value to set.
			* @param {*} value The value to set.
			* @returns {Object} Returns the hash instance.
			*/
			function hashSet(key, value) {
			var data = this.__data__;
			this.size += this.has(key) ? 0 : 1;
			data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
			return this;
			}

			module.exports = hashSet;