This error:
Parameter #1 ("1") to Some::Module::a_method did not pass the \'checking type constraint for Different::Module\' callback\n at /some/path/to/some/file/or/other.pm line 42
(but the parameters passed in are actually all correct)
...it could mean you forgot to shift off $self. pos_validated_list doesn't detect $self like validated_list and validated_hash do.
A piggy bank of commands, fixes, succinct reviews, some mini articles and technical opinions from a (mostly) Perl developer.
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