Data format used to communicate with openssh mux server.
Format details:
- All integers are encoded in big endian;
- Boolean are encoded as u32 according to here;
- char are encoded as u32;
- Strings and bytes are encoded as length(u32) + content, same as [sshbuf_put_string];
- Option::None are omitted while Option::Some(v) has the same encoding as v since
openssh mux protocol allows optional parameter at the end of the message;
- struct/tuple are encoded as-is, unit struct/tuple are omitted;
- sequence are encoded as if it is a tuple according to here, thus it cannot be
deserialized;
- Variant is encoded as index(u32) + content encoded as-is (it is expected to manually
implement Serialize and Deserialize to ensure the variant_index is the one
you expected);
- Serializing/Deserializing map is unsupported;
is_human_readable enables Serializer::is_human_readable and
Deserializer::is_human_readable.