Gets the native function at `key` of `object`.

@private
@param {Object} object The object to query.
@param {string} key The key of the method to get.
@returns {*} Returns the function if it's native, else `undefined`.
function getNative$4(object, key) {
	  var value = _getValue(object, key);
	  return _baseIsNative(value) ? value : undefined;
	}