This is a simple change to add ULMO format option (requires macOS 10.15+) in the json schema specification. I tested this locally by creating a lzma based dmg using appdmg.
For additional context, lzma has a high level of compression (e.g. for one of the chromium based apps I tested I see a difference from 240 MB (lzfse) vs 185 MB (lzma)) with a slower extraction time, but often the file size savings lzma produces against the decompression time are quite favorable.
This is a simple change to add ULMO format option (requires macOS 10.15+) in the json schema specification. I tested this locally by creating a lzma based dmg using appdmg.
For additional context, lzma has a high level of compression (e.g. for one of the chromium based apps I tested I see a difference from 240 MB (lzfse) vs 185 MB (lzma)) with a slower extraction time, but often the file size savings lzma produces against the decompression time are quite favorable.