I have a problem cleaning the cache of Class::Std::Fast. Here's my test code, which dies while joining the threads:

package STR;
use Class::Std::Fast cache => 1;


## ----------------  ----------------  ---------------- ##
package main;
use threads;
use 5.010;
use strict;
use warnings;

STR->new; # create and immediately throw away.

# Now do something completely different with threads:
threads->create( sub { sleep 2 && say "thread $_" } ) for 1..4;

$_->join for threads->list;
[download]

My STR class has caching enabled, which means Class::Std::Fast doesn't really destroy instances of that class, it squirrels them away to be reused next time STR->new is called. This breaks when threads are joined anywhere in the program, even if no STR objects are in scope.

What doesn't work:

• Calling ->DESTROY manually: The objects go out of scope anyway, see example above.
• Changing the import cache => 1. Caching really is desirable here.
• unloading Class::Std::Fast: My program needs to call 'CSF code -> threads -> CSF code' (although the CSF objects are completely different in the second call)
• Disabling caching in Class::Std::Fast::_cache_class_ref when I've finished using it.

That last idea seems the most promising. Class::Std::Fast::_cache_class_ref looks like this:

sub _cache_class_ref () {
    croak q{you can't call this method in your namespace}
        if 0 != index caller, 'Class::Std::';
    return \%do_cache_class_of;
}
[download]

Which means that just calling delete Class::Std::Fast::_cache_class_ref()->{STR} works beautifully, if I can only get around the croak!

Another avenue seems to be to dynamically override Class::Std::Fast::DESTROY, but doing this in a way that preserves all the original behaviour except caching would get very complex. Finding out if these behaviours even need to be preserved is even more complex.

Note: I'm not actually using Class::Std::Fast directly, I'm using SOAP::WSDL, which via 5 intermediate steps comes back to Class::Std::Fast. My real code is dying with

DESTROY created new reference to dead object
        'SOAP::WSDL::XSD::Typelib::Builtin::string' during global dest
+ruction (#1)
[download]

Does anyone have any suggestions?

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