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They will be needed in future, so we don't want to change the interface
then.

(not directly related to this branch but just happen to notice it)

such as an infinite loop (or perhaps segfault) in tests.
since this is critical and should be quite trivial, I'm pushing it right now.

this should be trivial enough, so I'll push it to the shared repo directly.

it currently fails.

of sending a notify.  adjusting the main code and tests to this behavior,
while keeping externally observable behavior as much as possible.