user_begin => sub {
    # PDL 2.076 introduced a regression causing all threads to perform
    # piddle destruction. PDL cleanup should occur once, preferably by
    # the thread which instantiated the object.
    no warnings;
    sub PDL::DESTROY { 0; }
},

##</code><code>##

SvOBJECT_off((SV *)it->sv);