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Sender: Mailing list for the LaTeX3 project <[log in to unmask]>
Date: Mon, 24 Aug 2015 17:33:58 -0700
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From: aparsloe <[log in to unmask]>
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It has taken me a while to get to grips with \tl_set_rescan:Nnn <tl var> 
{setup} {tokens}, not least the fact that *omission* from the setup 
means "revert to usual catcode". I think this is worth documenting in 
interface3.pdf, since it seems not unreasonable (at least it did to me) 
to suppose that if one has explicitly changed a catcode using 
\tl_set_rescan:Nnn, only a similarly explicit change would revert the 
catcode to its usual value. In particular it would be helpful to 
document the fact that using an empty setup { } reverts everything to 
usual values.


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