Version 2.2 introduces major refinements to internal data management, resulting in significant improvements to both initialization time and interactive performance.

Vega:

• Migrate to vega-dataflow 1.2.
• Migrate to datalib 1.4.5 aggregator.
• Optimize streaming aggregation updates.
• Improve default axis formatting for log scales.
• Change transform reset parameter from flag to counter.
• Fix force layout parameter update bug.
• Remove deprecated Zip transform. (Use Lookup instead.)

Vega Dataflow:

• Overhaul tuple derivation and previous value handling.
• Remove now unneeded dataflow node "revises" flag.