- Don't pollute server logs when types looked for by `TypeInfo.fetch()`
are not found (:ticket:`#473`).
- Set `Cursor.rowcount` to the number of rows of each result set from
`~Cursor.executemany()` when called with `!returning=True` (:ticket:`#479`).
- Fix `TypeInfo.fetch()` when used with `ClientCursor` (:ticket:`#484`).
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