This Barrage project is the wire-format extension of arrow-flight to support ticking data sets.
In this project contains a few methods to augment to Apache Arrow Flight to support out-of-band client-streams for javascript clients.
See documentation here: https://deephaven.io/barrage/docs/
This library is at its 1.0.0 release, and versioning semantics are still being worked out. FlatBuffer enables forward and backward compatibility for the wire format itself. As FlatBuffers does not follow SemVer, and every release introduces breaking compile-time and runtime changes, each time the Flatbuffers library is update, it will amount to a new major release.