- Raise `DataError` instead of whatever internal failure trying to dump a
`~datetime.time` object with with a `!tzinfo` specified as
`~zoneinfo.ZoneInfo` (ambiguous offset, see :ticket:`#652`).
- Handle gracefully EINTR on signals instead of raising `InterruptedError`,
consistently with :pep:`475` guideline (:ticket:`#667`).
- Fix support for connection strings with multiple hosts/ports and for the
``load_balance_hosts`` connection parameter (:ticket:`#674`).
- Fix memory leak receiving notifications in Python implementation
(:ticket:`#679`).
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