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- o Major features (subprotocol versions):
- - Tor now uses "subprotocol versions" to indicate
- compatibility. Previously, versions of Tor looked at the declared Tor
- version of a relay to tell whether they could use a given feature.
- Now, they should be able to rely on its declared subprotocol versions.
- This change allows compatible implementations of the Tor protocol(s) to
- exist without declaring compatibility with pretending to be particular
- releases of Tor itself. Closes ticket 19958; implements part of
- proposal 264.
- - Tor directory authorities now vote on a set of recommended subprotocol
- versions, and on a set of required subprotocol versions. Clients and
- relays that lack support for a _required_ suprotocol version will not
- start; those that lack support for a _recommended_ subprotocol version
- will warn the user to upgrade. Closes ticket 19958; implements part of
- proposal 264.
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