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bug#26925: Improve /doc/lispref/strings.texi (split-string) documentatio

From: Eli Zaretskii
Subject: bug#26925: Improve /doc/lispref/strings.texi (split-string) documentation
Date: Sun, 04 Jun 2017 18:46:39 +0300

> From: Jean-Christophe Helary <address@hidden>
> Date: Mon, 5 Jun 2017 00:14:14 +0900
> Cc: Michael Albinus <address@hidden>,
>  address@hidden,
>  address@hidden
> If you don't want to see that string change, just say so and I'll drop it.

I thought I did, in the very first response to your change suggestion.

But if that makes you so much unhappy, please go ahead and make the

> >> And btw, the docstring of `split-string' does not speak about TRIM as
> >> "optional argument" either.
> > 
> > Which is a mistake, IMO, because the doc string uses neither of the
> > above 2 patterns, and so makes it sound like these arguments are not
> > optional at all.
> No, because in the function signature they are defined as optional.

And yet we usually do say explicitly in doc strings that optional
arguments are optional.

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