Function toKey

src/helpers/set.js:707–713

* Converts `value` to a string key if it's not a string or symbol. * * @private * @param {*} value The value to inspect. * @returns {string|symbol} Returns the key.

(value)

 * @returns {string|symbol} Returns the key.
 */
function toKey(value) {
  if (typeof value == 'string' || isSymbol(value)) {
    return value;
  }
  var result = value + '';
  return result == '0' && 1 / value == -INFINITY ? '-0' : result;
}

/**
 * Converts `func` to its source code.