The read deadline only gets control at a read, so code that computes without
reading escaped it. Give the pool a request_timeout above code_timeout. The
watchdog kills the worker, and execute() already replaces a dead session, so a
runaway call fails and the next call recovers. A read refusal keeps the
variables, so it has to win the race whenever code does read.
Restore test_open_file_objects_are_not_iterable. Replacing the neighbouring
write test by text range deleted it, which left the instructions carrying a
prohibition with nothing to signal when monty lifts it.
Reuse the VFS and the pool when a session is replaced, so recovery skips the
document scan. Mount metadata.json with a lambda rather than a factory. Cover
open() in write mode. Fold the crash entry into the pydantic-monty bullet,
because no release shipped the worker without it.
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