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$3(value) {
	  if (typeof value == 'string' || isSymbol_1(value)) {
	    return value;
	  }
	  var result = (value + '');
	  return (result == '0' && (1 / value) == -INFINITY$5) ? '-0' : result;
	}