This release includes small feature improvements in chunking, deflation, and attribute handling during dimension reduction. Also improvements in clarity and consistency of messages. While chunking is an esoteric feature for many, its importance is increasing as the move to netCDF4 (classic) continues. The chunking defaults and flexibility have reached a new level of robustness in this release. Benchmarks suggest this chunking can accelerate wallclock performance of netCDF4 workflows by 50% relative to 4.4.8.
The main new awesome feature is that ncra understands weights. Finally. Applying uneven weights to different input files was too clunky. This release is dedicated to the intrepid souls who use NCO to generate climatologies that require uneven weights. This release should make that task much easier.