function castSlice(array, start, end) {
  var length = array.length;
  end = end === undefined ? length : end;
  return (!start && end >= length) ? array : baseSlice(array, start, end);
}
Casts `array` to a slice if it's needed.

@private
@param {Array} array The array to inspect.
@param {number} start The start position.
@param {number} [end=array.length] The end position.
@returns {Array} Returns the cast slice.