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/** * 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;