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Since 2016 this mode was opt-in for a long time with the default being
single-threaded asyncio-based server implementation. We believe nobody
actually used multi-threaded ZEO5 server mode for real at all.
Multi-threaded server mode was deprecated this spring
(#190), and later found to
have concurrency bug that lead to data corruption
(#209).
Given deprecation status, instead of fixing those bugs let's finally
remove the multi-threaded server mode.