function baseRest(func, start) {
  return setToString(overRest(func, start, identity), func + '');
}
The base implementation of `_.rest` which doesn't validate or coerce arguments.

@private
@param {Function} func The function to apply a rest parameter to.
@param {number} [start=func.length-1] The start position of the rest parameter.
@returns {Function} Returns the new function.