Version 5.1.6 further polishes vertical interpolation, further improves NCZarr safety, and fixes minor ncremap issues, improves EAMxx support, adds basic support for regridding Coupler history files, and employs CF Conventions, where possible, on all input files regardless of whether they claim to be CF-compliant. This release can be skipped if you would not use the NCZarr and regridder improvements.