_baseKeys.js
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_baseKeys.js
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			var isPrototype = require('./_isPrototype'),
			nativeKeys = require('./_nativeKeys');

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

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

			/**
			* The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
			*
			* @private
			* @param {Object} object The object to query.
			* @returns {Array} Returns the array of property names.
			*/
			function baseKeys(object) {
			if (!isPrototype(object)) {
			return nativeKeys(object);
			}
			var result = [];
			for (var key in Object(object)) {
			if (hasOwnProperty.call(object, key) && key != 'constructor') {
			result.push(key);
			}
			}
			return result;
			}

			module.exports = baseKeys;