I'm confused, for me it looks like you are just assigning the old values back.²
And if IIRC nested packages are hold in the %main:: stash.¹
So either your example is wrong or I'm lacking enough understanding of whats going on.
1) wrong, I misunderstood perlmod
{
package ding::dong;
$x=1
}
$\="\n";
print $ding::dong::x; # prints 1
print $main::{"ding::"}; # *main::ding::
print $main::{"ding::"}->{"dong::"}; # *ding::dong::
print $main::{"ding::"}->{"dong::"}->{x}; # *ding::dong::x
2) AHH now I got it... you're just keeping the sub packages (here "dong::" of "ding::") and cleaning anything else.
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