Hello, fishermen.

I'm wondering about setting exported or universal variables.

If I've set some variable using 'set -xU EN value', is that possible
change EN to some new value instantly? e.g. aleady opened fish
instances. It looks like cannot change 'set -xU'ed varibles. Both
current fish session and new session only see previous value.

If I need some varibale in all fish instance(interactive + function),
what is recommended way? 'set -x' in 'config.fish' or 'set -xU' in
interactive session? What is differences with them? How about difference
between 'set -x' and 'set -xU'?

-- 
Mait
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