From: Eli Zaretskii <eliz@gnu.org>
To: "Géza Herman" <geza.herman@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Improving JSON pretty printing, how to represent floats?
Date: Fri, 05 Apr 2024 15:35:22 +0300 [thread overview]
Message-ID: <86bk6o56np.fsf@gnu.org> (raw)
In-Reply-To: <87msq8w2zm.fsf@gmail.com> (message from Herman, Géza on Fri, 05 Apr 2024 11:39:10 +0200)
> From: Herman, Géza <geza.herman@gmail.com>
> Date: Fri, 05 Apr 2024 11:39:10 +0200
>
> There is a thing that I don't like about the current
> json-pretty-print: as it parses floats, pretty printing can be
> lossy. If one pretty prints this
>
> --8<---------------cut here---------------start------------->8---
> {
> "a": 3.333333333333000000000000000001
> }
> --8<---------------cut here---------------end--------------->8---
>
> then the float gets rounded. I think pretty printing should be
> lossless (keeping the exact format, exp notation, etc.).
The digits in 3.333333333333000000000000000001 after 16th digit are
meaningless: they aren't supported by IEEE floating-point standard, so
they are just numerical noise. Thus, talking about "lossless" wrt
them makes little sense to me.
next prev parent reply other threads:[~2024-04-05 12:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-05 9:39 Improving JSON pretty printing, how to represent floats? Herman, Géza
2024-04-05 12:35 ` Eli Zaretskii [this message]
2024-04-05 12:53 ` Mattias Engdegård
2024-04-05 12:55 ` Herman, Géza
2024-04-05 13:09 ` Eli Zaretskii
2024-04-05 13:16 ` Herman, Géza
2024-04-05 14:01 ` tomas
2024-04-05 15:34 ` Eli Zaretskii
2024-04-05 16:46 ` Herman, Géza
2024-04-05 13:37 ` Dmitry Gutov
2024-04-05 14:20 ` Herman, Géza
2024-04-05 16:47 ` Dmitry Gutov
2024-04-05 14:18 ` Mattias Engdegård
2024-04-05 14:25 ` Herman, Géza
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