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Done: Add retryWrites MongoClient and URI option.
Done: Add monotonically increasing txnNum to server sessions.
Done: Add retryable behavior to insert_one, update_one, replace_one, delete_one, find_one_and_*
Done: Refactor _do_batch_write_command to generate a single message.
Done: Add retryable behavior to insert_many and bulk_write.
~~Handle txnNum overflow by throwing an error and/or discarding server sessions with very high txnNums.~~
- Handling overflow is not necessary in practice. It would take roughly 300,000 years with 1 million transactions per second (with a single session) for the transaction id to overflow. On the off chance it does overflow, PyMongo's bson library will throw an OverflowError anyway.

is depended on by

DRIVERS-396 All writes retryable support

is related to

PYTHON-1396 Avoid encoding the overflow document twice when a batched write command is split