It's two class variables - one is a hash, the other is an array of hashes, so sticking them in a constant is messy ( because then its a constant to an anonymous ref , which is a PITA when dereferencing. Both are used by class instances as configuration settings- i glanced at teh code the other day and realized 'hey, with a few more lines i could totally abract these 3 functions into 1' and did.

For now, I just stuck a reference to the data in the instance, but i hate doing that with these structures, because now instead of:

 sub func(){
  my ($self) = @_;
  foreach my $a (@b){}
  foreach my $a (keys %c){}
 }
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i have

 sub func(){
  my ($self) = @_;
  my @b = @{$self->{'_class_b'}}
  my %c = %{$self->{'_class_c'}}
  ...
 }
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which does that annoying coercion into a new array / hash ( i can't just deref and address the needed items, as i need t o loop and nest through them all)