Optionalbrotlibrotli window bits (10..30); above 24 enables the non-standard large-window mode (reader must opt in)
Optionalbrotlibrotli quality for the .br output; 11 is smallest but slow, lower is much faster for a small size cost
Optionallevelzstd compression level (1..22) for the .zst output (default 19)
Optionaloninvoked after each shard file is written (for progress logging)
Optionalpackassemble a clean copy-into-flowR folder holding just the compressed shards, the dictionary and the manifest
options for writeShardedDatabase