From: Gene Tani <gene.tani@...>
Date: 2005-10-31T23:22:06+09:00
Subject: Re: determining whether an object is an immediate?

I'm confused, don't you need to only check that least signif. bit is 1,
whereas #zero? and #nonzero? look at everything except LSB on a Fixnum,
once they've figured out whether object is Fixnum, Float or Bignum?

Also, i noticed that python people noticed about tagged integers:
http://mail.python.org/pipermail/python-dev/2004-July/046139.html

Eric Mahurin wrote:

> Looking at the C code (ruby.h: SPECIAL_CONST_P), another option would be
> this:
>
> id = obj.__id__
> (id&3).nonzero? || (id&~4).zero?
>
> As long as ruby continues to encode immediates as it does now (can add
> more), this should work.