Subject: bug#24935: [PATCH] Add tests for rot13.el

From: Eli Zaretskii <[email-masked]>
Date: Tue, 15 Nov 2016 22:23:32 +0200

> Date: Tue, 15 Nov 2016 19:43:55 +0100
> From: Simen Heggestøyl <[email-masked]>
> Cc: [email-masked]
> 
>   "ROT13 encrypt OBJECT, a buffer or string.
> Return the ROT13 encrypted string when OBJECT is a string,
> ignoring START and END.  ROT13 encrypt the region between
> positions START and END when OBJECT is a buffer; all three
> arguments are then required."

It sounds strange to describe first the use case where the arguments
are ignored.  I suggest this instead:

  ROT13 encrypt OBJECT, a buffer or string.
If OBJECT is a buffer, encrypt the region between START and END.
If OBJECT is a string, encrypt it in its entirety, ignoring START
and END, and return the encrypted string.