I think it's important to stay accurate:

> our creates a package global in the package where that declaration occurs

our will create a new STASH entry only, iff it doesn't already exist and it will not touch the value.

> local is about aliasing package globals

I can't see any "aliasing" process here, it's still the same underlying package variable.

what do you call an "alias" here when doing local $main::bob; ?