> On 18 Sep 2017, at 04:39, Brian S. Julin via RT > <perl6-bugs-follo...@perl.org> wrote: > > On Sun, 17 Sep 2017 08:44:47 -0700, c...@zoffix.com wrote: >> More comments on similar issue: https://irclog.perlgeek.de/perl6/2017- >> 09-17#i_15176823 >> >> Basically, a lot of core constructs aren't workable with user-land >> subclasses. > > Note on the performance concerns... if we had a faster-than-a-where-clause > type smiley > (or other mechanism) that only accepted the exact type, not subclasses, then > the core could provide very optimized implementations for core types as > separate > candidates, and a more generic implementation for subclasses, which would be > slower > but less likely to be affected by internals churn.
Technical note: that would mean internally using nqp::eqaddr vs nqp::istype.
