[NTG-context] \switchtobodyfont behaves differenctly with splitted parameters

[Sylvain Hubert]

On Sun, 8 Nov 2020 at 12:14, Hans Hagen <j.hagen at xs4all.nl> wrote:

> when yyou use several bodyfonts you can do this before \starttext:
>
> \usebodyfont[face,24pt]
> \usebodyfont[deface]
>
> \starttext
>    ....
> \stoptext
>

Thank you for the information, Hans!

Could you please also shed some light on the relation/difference among
\{setup,switchto,use}bodyfont?
There seems to be not much documentation on this. Can one conclude, from the
wiki <https://wiki.contextgarden.net/Command/switchtobodyfont> and the source
code
<https://source.contextgarden.net/tex/context/base/mkiv/font-ini.mklx#l2287>,
that they are mostly the same, except that \switchtobodyfont is restricted
to the content area, and \usebodyfont is a helper to call \setupbodyfont in
the beginning?

If this is the case, is it recommended to always put a \setupbodyfont[...]
in the beginning, even if it's just a \setupbodyfont[modern]?
One reason might be that the following example somehow enlarges the page
number in the header, intuitively contradicting what is claimed by the wiki
<https://wiki.contextgarden.net/Command/switchtobodyfont>:

    \switchtobodyfont[dejavu]
    \starttext \switchtobodyfont[dejavu, 24pt]a\stoptext

Thanks!

Sylvain
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