Fix connection closing issue in conncection pool #113
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Was used the maximum value of a 64-bit unsigned integer (18446744073709551615) to indicate an undefined or special state for affected_rows, apparently to mimic MySQL's behavior. To avoid overflow issues and improve compatibility, now use -1, which serves the same purpose in a signed integer context. This change avoids compilation warnings.
fix: avoid overflow issues
- use `conn.ensure_closed()` in `fill_free_pool()` and `wait_closed()` - fix docstring of `Connection.ensure_closed`
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Fixes #112
conn.close()withconn.ensure_closed()inPool.fill_free_pool()andPool.wait_closed().Connection.ensure_closed