finalizer may never be called

[dpinol]

Is your feature request related to a problem? Please describe.
In Julia, it looks like finalizers are always called when exiting.
E.g., the following code always prints "hola".

mutable struct S
    a
end
function S()
    return finalizer(_->Core.println("hola"), S(3))
end
S()

However, if we wrap it with juliacall, the finalizer is never executed.

import juliacall
juliacall.Main.include("kk.jl")

Describe the solution you'd like
I'd like finalizers to always be executed

Describe alternatives you've considered
My current workaround is finishing with

juliacall.Main.GC.gc()

[cjdoris]

Ok yeah looks like I should call jl_atexit_hook to stop the Julia runtime when Python exits. https://github.com/JuliaLang/julia/blob/f3298ee5e2b08f633a6a313d094c732ff1ce7e85/src/init.c#L236

[dpinol]

thanks, @cjdoris what about #516 ?
I works with this

Main.seval(
            """ mutable struct S
                    a
                end;
                function S()
                    return finalizer(_->Core.println("works!!!"), S(3));
                end;
                S();
        """