Re: Introducing thread-safe Tramp

[Richard Stallman]

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  > Even `C-u' (`universal-argument') is not a prefix argument. It is a command 
that begins reading a prefix argument and that, possibly together with other 
commands (such as `digit-argument') provides that prefix argument to a followup 
command.

We think of C-u as beginning a prefix argument, without exception.
Sometimes the prefix argument consists of C-u and nothing but C-u.

However, I agree it is clearest NOT to think of C-x RET c
as a prefix argument.  The prefix argument is a specific kind of value
and that is not how C-x RET c works.

-- 
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)