_mapCacheSet.js
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_mapCacheSet.js
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			var getMapData = require('./_getMapData');

			/**
			* Sets the map `key` to `value`.
			*
			* @private
			* @name set
			* @memberOf MapCache
			* @param {string} key The key of the value to set.
			* @param {*} value The value to set.
			* @returns {Object} Returns the map cache instance.
			*/
			function mapCacheSet(key, value) {
			var data = getMapData(this, key),
			size = data.size;

			data.set(key, value);
			this.size += data.size == size ? 0 : 1;
			return this;
			}

			module.exports = mapCacheSet;