From: TRANS <transfire@...>
Date: 2005-09-20T09:29:09+09:00
Subject: Re: proposed attr writer patch

Though I had done so myself in the past with I no longer think it
worth the bother to enforce boolean-ness. In Ruby there really isn't
such a thing per se. Either it is nil or it is false, or it is not
(and thus true).

The only really general purpose use I found for #foo! is

  def foo!(*arg)
    return @foo if arg.empty?
    @foo = arg[0]
    self
  end

Usable as chainable setter method. But there is no general precedence for this.

T.