These are likely temporary changes but still needed to actually see the
desired/correct failures (of which 5 of 6 tests are supposed to fail rn)
mostly to do with `Start` and `Return` msgs which are invalid under each
test's applied msg-spec.
Tweak set here:
- bit more `print()`s in root and sub for grokin test flow.
- never use `pytes.fail()` in subactor.. should know this by now XD
- comment out some bits that can't ever pass rn and make the underlying
expected failues harder to grok:
- the sub's child-side-of-ctx task doing sends should only fail
for certain msg types like `Started` + `Return`, `Yield`s are
processed receiver/parent side.
- don't expect `sent` list to match predicate set for the same reason
as last bullet.
The outstanding msg-type-semantic validation questions are:
- how to handle `.open_context()` with an input `kwargs` set that
doesn't adhere to the currently applied msg-spec?
- should the initial `@acm` entry fail before sending to the child
side?
- where should received `MsgTypeError`s be raised, at the `MsgStream`
`.receive()` or lower in the stack?
- i'm thinking we should mk `MsgTypeError` derive from
`RemoteActorError` and then have it be delivered as an error to the
`Context`/`MsgStream` for per-ctx-task handling; would lead to more
flexible/modular policy overrides in user code outside any defaults
we provide.
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