It looks like in .cljc files cider now does color syntax only for the current REPL. Is there a way to force it to color both clj/cljs?

How do you use a cider key binding that says in the docs "If invoked with a prefix argument"?

In emacs terminology, you provide a prefix-argument to a function by typing (by default) C-u (the control key and the u key at the same time) just before the key binding for the cider function.

So, for example C-c C-o will clear the output buffer of the last output, but C-u C-c C-o will clear the entire output buffer.

If you want more details, see https://www.emacswiki.org/emacs/PrefixArgument and https://www.gnu.org/software/emacs/manual/html_node/elisp/Prefix-Command-Arguments.html

Thanks