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weird \s

From: Doug McIlroy
Subject: weird \s
Date: Mon, 30 Mar 2020 19:16:56 -0400
User-agent: Heirloom mailx 12.5 7/5/10

Does anyone else see the following behavior?
Version 1.22.4 handles \s correctly up to \s39, but
truncates a size of 40 or greater to its first
digit. Here are two screen shots, with ^D edited in
to show where input ends and output begins.

groff | tail -5
\s39 hello
/F0 39/Times-Roman@0 SF(hello)81.75 12 Q 0 Cg EP

groff |tail -5
\s40 hello
/F0 4/Times-Roman@0 SF 1(0h)72 12 S(ello)-1 E 0 Cg EP

The second example takes "0" as text, not part of the number 40.
I met the behavior with \s48. It continues at least 
through \s50.


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