id,node_id,number,title,user,user_label,state,locked,assignee,assignee_label,milestone,milestone_label,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,repo_label,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
925677191,MDU6SXNzdWU5MjU2NzcxOTE=,289,Mypy fixes for rows_from_file(),857609,adamchainz,closed,0,,,,,3,2021-06-20T20:34:59Z,2021-06-22T18:44:36Z,2021-06-22T18:13:26Z,NONE,,"Following https://github.com/simonw/sqlite-utils/issues/279#issuecomment-864328927

You had two mypy errors.

The first:

> sqlite_utils/utils.py:157: error: Argument 1 to ""BufferedReader"" has incompatible type ""BinaryIO""; expected ""RawIOBase""

Looking at the `BufferedReader` docs, it seems to expect a `RawIOBase`, and this [has been copied into typeshed](https://github.com/python/typeshed/blob/9ec2f8712480c57353cea097a65d75a2c4ec1846/stdlib/io.pyi#L100). There may be scope to change how `BufferedReader` is documented and typed upstream, but for now it wouldn't be too bad to use a `typing.cast()`:

```
# Detect the format, then call this recursively
buffered = io.BufferedReader(
    cast(io.RawIOBase, fp),  # Undocumented BufferedReader support for BinaryIO
    buffer_size=4096,
)
```

The second error seems to be flagging a legitimate bug in your code:

> sqlite_utils/utils.py:163: error: Argument 1 to ""decode"" of ""bytes"" has incompatible type ""Optional[str]""; expected ""str""

From your type hints, `encoding` may be `None`. In the CSV format block, you use `encoding or ""utf-8-sig""` to set a default, maybe that's desirable in this case too?
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