Brandon Williams <bmw...@google.com> writes:

> While we could wrap the preamble into a function it sort of defeats the
> purpose since you want to be able to call different functions based on
> the protocol version you're speaking.  That way you can have hard
> separations between the code paths which operate on v0/v1 and v2.

As I envision that the need for different processing across protocol
versions in real code would become far greater than it would fit in
cases within a single switch() statement, I imagined that the reader
structure would have a field that says which version of the protocol
it is, so that the caller of the preamble thing can inspect it later
to switch on it.

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