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{
    package MyArray;
...

$a0->push(2.0);
dump_it($a0);

bless( {"myarray" => [[0],[0,0,0],[1,2,3]]}, 'MyArray' )
bless( {"myarray" => [[0],["cat"],[1,2,3]]}, 'MyArray' )
bless( {"myarray" => [[0],["cat"],[1,2,3],[2]]}, 'MyArray' )

subtype 'MyArray::Ents::Level2'
    => as 'ArrayRef[Str|Num|Int]';
...
...

isa => 'MyArray::Ents'

Can't call method "is_a_type_of" on an undefined value at .../Moose/Me
+ta/Attribute/Native/Trait.pm line 98