var isSymbol = require('./isSymbol');
  
  /** Used as references for various `Number` constants. */
  var INFINITY = 1 / 0;
  
  /**
   * 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.
   */
  function toKey(value) {
    if (typeof value == 'string' || isSymbol(value)) {
      return value;
    }
    var result = (value + '');
    return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
  }
  
  module.exports = toKey;