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Message-ID:  <F9F9D8FE-A1E6-4E89-AB97-CD9D85D5C8F4@gmail.com>
Date:         Mon, 22 Mar 2021 10:58:47 -0500
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              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
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From:         Don Hosek <don.hosek@GMAIL.COM>
Subject: Bug in fontdef.dtx?
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Envelope-To: <rainer.schoepf@gmx.net>
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Status: R

fontdef.dtx defines the various series, family and style defaults using \newcommand, e.g.

\newcommand\itdefault{it}
\newcommand\sldefault{sl}
\newcommand\scdefault{sc}
\newcommand\updefault{up} 

This gives defines them as \long However, the commands \fontfamily, \fontseries and \fontshape define \f@family, \f@series and \f@shape using \edef which maked the resulting values not \long

This means that code that would do something like, e.g., \ifx\f@shape\itdefault…\fi will not work as expected.

The simplest fix would be to use the starred form of \newcommand for setting the various \XXdefault values. I would imagine that this should not break anything

-dh