From: SASADA Koichi <ko1@...>
Date: 2008-12-09T23:39:29+09:00
Subject: [ruby-core:20442] Re: Leave my open classes alone (was Behavior: autoload calls rb_require()  directly)

Ken Bloom wrote::
> Even so, where would you get space for the tag from? Ruby's documentation 
> says that a "Float objects represent real numbers using the native 
> architecture���s double-precision floating point representation," and a 
> double is 64 bits on most 32- and 64-bit operating systems.

Good point.

A method is written in my paper, but it is written in Japanese.

This is ruby.h for embed double.
http://www.atdot.net/sp/view/e76mbk

rb_float_new(), NUM2DOUBLE() and RFLOAT_VALUE() have a trick.  It
generates 1 bit for Float.  However Fixnum consumes 3 bit tags.

-- 
// SASADA Koichi at atdot dot net