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8508c0ed1f
We don't canonicalize on archive nodes and thus `best_canonical` always returned `None`. So, the moment such a node tried to force canonicalize, it was trapped in some endless loop. This pr solves this by renaming `best_canonical` to `last_canonicalized` and also making the return value more clear by introducing a custom enum `LastCanonicalized`.
Client backend that is backed by a database.
Canonicality vs. Finality
Finality indicates that a block will not be reverted, according to the consensus algorithm, while canonicality indicates that the block may be reverted, but we will be unable to do so, having discarded heavy state that will allow a chain reorganization.
Finality implies canonicality but not vice-versa.
License: GPL-3.0-or-later WITH Classpath-exception-2.0