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LF characters, so instead of directly parsing the JSON stream, the client
may also read single lines and then decode the JSON array contained in
each line.

Note 1: This means that one can use C<telnet> or a similar program to test
the protocol, as the server ignores ASCII CR and LF characters but sends
its responses as single lines.

Note 2: There are two principal parsing strategies: the obvious one is to
read a single (potentially very large) line and then decode it, and the
less obvious one is to use a streaming parser and simply read JSON arrays
one after each other.

=head2 MESSAGE LAYER

Server and client can send messages to each other at any time (usually the
client first has to wait and parse the initial server greeting, though, to
see what kind of authentication is required).

All messages are JSON arrays in one of the following formats: