From: Ryo <furue@...>
Date: 2010-08-11T09:30:14+09:00
Subject: "NaN".to_f revisited

Hi all,

I thought ".to_s.to_f" should be an identity operation on any floating
point number, apart from a potential truncation error.

On Ruby 1.8.7,

   a = 0.0/0.0
   a.to_s # => "NaN"
   "NaN".to_f #=> 0.0

Therefore,

  a.to_s.to_f  #=> 0.0,

which isn't acceptable to me.  Consider writing floating point numbers
to a text file and reading them back in.

Is this a bug in 1.8.x?  I searched Google but couldn't get a
definitive answer.

Regards,
Ryo