function createFindKey(objectFunc) {
	      return function(object, predicate, thisArg) {
	        predicate = getCallback(predicate, thisArg, 3);
	        return baseFind(object, predicate, objectFunc, true);
	      };
	    }
Creates a `_.findKey` or `_.findLastKey` function.

@private
@param {Function} objectFunc The function to iterate over an object.
@returns {Function} Returns the new find function.