I am not sure if they are executed at shut down, it was one of the purposes for
fixup-free function, cleaning up at shut down, but this one was not pursued and
it is rather tricky because it can be done mainly only for the main process,
which is not doing anything at runtime. Also, it can slow the restarts ...
Anyhow, one place where they should be used is when using the `modf(...)` from
KEMI, which should be avoided. Another one, which would be the most important,
iirc, is when having expressions in the parameters of config functions, like:
```
func1($var(x) + $var(y));
```
instead of:
```
func1("$var(x)$var(y)");
```
Anyhow, you should test to validate the above, I was not the one developing the
config interpreter when they were added.
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