Event(..., delay=..., internal=True) error shows the placeholder id instead of the attribute name #679

Found during the adversarial review of the 3.2.2 release notes.

Declaring go = Event(a.to(b), delay=50, internal=True) correctly raises InvalidDefinition (#668), but the message names the placeholder id: Event __event__<uuid> cannot be both delayed and internal. Event.__new__ runs the check before the class attribute name is known; only an explicit id= shows a useful name. The doctest in the notes hides it with IGNORE_EXCEPTION_DETAIL.

Expected: the error names the event (go), e.g. by deferring the check until the metaclass binds the attribute name.

Related minor: send("go", delay=0) cannot override a declared delay, because 0 is treated as "not given" (falsy check). An explicit delay=0 should win, the same way an explicit internal=False does.