our %error_dictionary = ...;
our %cached_templates = ...;
sub get_template { .... check cache or store in cache ... }
sub get_error { $error_dictionary{...} ... }
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If these were, my lexical, then its hard to peek inside for folks that need to ...

Being our globals, anyone who wants to peek can do so at their own risk, an know to stick with the official api for officialness

one or the other, it doesn't really matter, this is the least important type of implementation detail... but you can't go wrong with openness (our our our)

https://metacpan.org/module/DROLSKY/perl-5.15.6/pod/perlootut.pod, chromatics free book Modern Perl, Moo, Re^3: High level OOP query (internal data)