.list/.hash can give any Positional/Associative, but core code has stricter assumptions

[zoffixznet]

This is probably more of a docs Issue:

Based on previous discussions in R#1344, it was stated that .list can return any Positional. However, a bunch of core code assumes it'll get a something a lot more like a List from that method.

A Positional doesn't require implementation of .kv, for example, so if I return this class from .list, I get an infiniloop hang because it keeps trying to coerce itself to something more like a List:

$ perl6 -e 'class :: does Positional { method list { self } }.new.kv.perl.say'
^C

Should the description of .list be more like return any core Positional type?

[lizmat]

Probably :-)