How are identifiers for 'use server' functions determined?

[knpwrs]

When I visit my deployed application and look at a call to a 'use server' function in the network inspector, I see an endpoint like /_server/?id=c_68ih0e&name=%24%24function0.

I was curious how the id and name parameters were determined, and what the implications of those determinations are for deployment.

For instance, if I add a 'use server' function above the one this is calling, does this function become function1? If the body of the function changes, does the id change?

Most importantly: if these parameters change, what happens to a stale client that is still running old client code?

Is there a way to determine these function names deterministically? Something like 'use server <name>'. I attempted using non-anonymous functions but it didn't appear to change anything.