2 * Checks if `value` is suitable for use as unique object key.
5 * @param {*} value The value to check.
6 * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
8 function isKeyable(value) {
9 var type = typeof value;
10 return type == 'number' || type == 'boolean' ||
11 (type == 'string' && value !== '__proto__') || value == null;
14 module.exports = isKeyable;