/**

* Checks if `value` is suitable for use as unique object key.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is suitable, else `false`.
*/

function isKeyable(value) {

var type = typeof value;
return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
  ? (value !== '__proto__')
  : (value === null);

}

module.exports = isKeyable;