RT #53302 extends the meanings of various sub flags such that :vtable now always implies :anon. As such, I think we can either apply this patch or reject it, given that we expect a refactor of :vtable and :method handling to occur at some point in the future.
Personally I'd suggest to reject it for now. Once possible workaround
might be to do
.sub "" :anon :vtable('get_integer')
Pm
