From: Marc-Andre Lafortune <ruby-core-mailing-list@...>
Date: 2010-05-12T01:52:56+09:00
Subject: [ruby-core:30163] Re: [Bug #3273] Float string conversion

Hi,

On Tue, May 11, 2010 at 7:30 AM, Yusuke ENDOH <mame@tsg.ne.jp> wrote:
> Interesting. �18 cannot be necessary, and 15 cannot be too much,
> so it is enough to try 15, 16 and 17 digits. �Right?

Indeed. I found a reference for that result:
http://www.eecs.berkeley.edu/~wkahan/ieee754status/ieee754.ps (check
page 4)