_assignMergeValue.js
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_assignMergeValue.js
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			var baseAssignValue = require('./_baseAssignValue'),
			eq = require('./eq');

			/**
			* This function is like `assignValue` except that it doesn't assign
			* `undefined` values.
			*
			* @private
			* @param {Object} object The object to modify.
			* @param {string} key The key of the property to assign.
			* @param {*} value The value to assign.
			*/
			function assignMergeValue(object, key, value) {
			if ((value !== undefined && !eq(object[key], value)) \|\|
			(value === undefined && !(key in object))) {
			baseAssignValue(object, key, value);
			}
			}

			module.exports = assignMergeValue;