Anders Kaseorg 13a2ac7b8e request: Remove ExtractRecipients type safety hole on REQ. ...

It was allowing us to get away with wrong types on a few functions:
`check_send_typing_notification` and `send_notification_backend` can be
(and are) called with a list of `int` as `notification_to`, not just a
list of `str`.

The problem it was working around already had a better solution using
the dummy `type` argument.  Use that.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

2019-08-07 15:26:59 -07:00

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