Subs are only inherited when called as (class or object) methods, as opposed to functions.

Thanks, I didn't know that.

"Did you really need to post 100s of lines to show constants aren't inherited?"

Well, given that I didn't know what aspect of my code was causing the problem, and that this is indeed a stripped-down version of it... I apologise for offending you.

Hmm, I was going to comment on your => note, but I see you've already removed that comment. Never mind.