[PEAK] Re: trellis.Set.discard

[Sergey Schetinin]

>> Hm.  ISTM that this is a bug in Component creation, in that it should push
>> and restore read-onlyness.  The make() should be idempotent with respect to
>> the @compute rule.
>
> Unfortunately, it's not *quite* that simple.  What's really needed is to
> allow changes to cells even during "read-only" periods, as long as they are
> "new".

Wow.. I don't really understand why this is needed, but wouldn't it
also open a possibility for bugs where some read-only rules change a
new cell when they shouldn't? Like performer changing an attribute of
a component acquired from @make, it wouldn't get caught the first time
around, right?