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This changes the internal representation to be `NonZeroU32` instead of
just `u32`.
Various places where a circuit ID is optional now use `Option<CircId>`.
Fixes a bug in `CircIdRange::sample` that would previously return a
circuit ID of 0, when the rng returned 0x8000_0000 for a low range.
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We now manipulate raw relay cell bodies as (an alias for)
`Box<[u8;509]>` rather than as (an alias for) `[u8;509]`. This
enables us to do much less copying. It will become more important
soon, as we defer parsing relay cell bodies even longer.
Related to #7.
We also use SliceWriter to avoid allocating a Vec<> for every relay
message we want to encode, and instead encode directly into the
cell.
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Doing this will make it much easier to implement a macro that
generates restricted instances of the Msg types (for #525).
The Body change is a breaking change. I don't think anybody else
implements Body, but in theory they could.
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These are generalizations of RelayCell and ChanCell respectively,
that allow using an arbitrary message type in place of the fully
general RelayMsg and ChanMsg types. Doing this is a prerequisite
for usefully implementing arti#525.
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This commit extends comments that make references to historical protocol
versions of Tor, by adding the concrete protocol version numbers.
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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