The second argument to `ExceptionGroup` is positional-only. The `exceptions` property always returns a tuple, no matter what the type of the original `__exceptions` argument is.
The documentation states:
* datagram_received: "data is a bytes object containing the incoming data."
* pipe_data_received: "data is a non-empty bytes object containing the received data."
Changes:
* Added the missing methods `selected_alpn_protocol()` and `version()` to `SSLObject`
* Fixed the naming of the `shared_ciphers()` method in `SSLSocket` and `SSLObject` (was missing the last "s")
* Fixed return type of `cipher()` (it's documented to return `None` if no connection has been established)
* Fixed second argument in cipher and shared_ciphers
The TLS version is a string, like "TLSv1.2".
* Added explicit overloads for getpeercert()
Its return type can be determined statically based on the `binary_form` argument.
Alex Grönholm