code: function isKeyable$1(value) {
    var type = typeof value;
    return type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean' ? value !== '__proto__' : value === null;
  }
docs: 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`.