Re: how to calculate the size of string in bytes?

[Eli Zaretskii]

> Date: Tue, 18 Aug 2015 16:45:30 +0200
> Cc: help-gnu-emacs@gnu.org
> From:  <tomas@tuxteam.de>
> 
> Perhaps you know that off-hand, but I can look it up/try it out: probably
> encode-coding-string and process-send-string would both fail, if the target
> coding system is set to UTF-8?

Why should it fail?  In which use case?  I'm probably missing
something.