_customDefaultsAssignIn.js
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_customDefaultsAssignIn.js
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			var eq = require('./eq');

			/** Used for built-in method references. */
			var objectProto = Object.prototype;

			/** Used to check objects for own properties. */
			var hasOwnProperty = objectProto.hasOwnProperty;

			/**
			* Used by `_.defaults` to customize its `_.assignIn` use to assign properties
			* of source objects to the destination object for all destination properties
			* that resolve to `undefined`.
			*
			* @private
			* @param {*} objValue The destination value.
			* @param {*} srcValue The source value.
			* @param {string} key The key of the property to assign.
			* @param {Object} object The parent object of `objValue`.
			* @returns {*} Returns the value to assign.
			*/
			function customDefaultsAssignIn(objValue, srcValue, key, object) {
			if (objValue === undefined \|\|
			(eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
			return srcValue;
			}
			return objValue;
			}

			module.exports = customDefaultsAssignIn;