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bug#32252: [PATCH] %o and %x now format signed numbers

From: Paul Eggert
Subject: bug#32252: [PATCH] %o and %x now format signed numbers
Date: Mon, 23 Jul 2018 19:04:48 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Drew Adams wrote:
Put that motivation in NEWS.  Users deserve to be told why
things change incompatibly.

OK, here's a revised NEWS entry. It also mentions avoiding read/print misbehavior, a more-immediate prompt for this change that I forgot to mention previously.

** Numbers formatted via %o or %x are now formatted as signed integers.
Formerly they were formatted using machine-dependent two's complement
representations.  The new behavior is machine-independent, avoids
misbehavior in calls like (read (format "#x%x" -1)), and is more
compatible with bignums, a planned feature.  To get the old behavior,
set the new, experimental variable binary-as-unsigned to t and please
email address@hidden if you need that.  Because %o and %x now
format signed integers, they now support the + and space flags.

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