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2. Data Model
-------------

Whenever a value is sent across the connection between the server and a
client, that value has a fixed type. The underlying streaming layer
recognises the following fundamental types of values. Each type has a
string to identify call it, called the signature. These are used by
introspection data; see later.

 * Booleans

   Uses the type signature "bool".

 * Integers, both signed and unsigned, in 8, 16, 32 and 64bit lengths