lossless

The identity transform. Source bytes flow through unchanged; ZSTD does all the work.

• Target streams: m/z and intensity
• Loss: none
• Source: src/algos/lossless.c
• CLI: the default when neither --mz-lossy nor --int-lossy is set

Use when you can't accept any precision loss. The compression ratio depends entirely on ZSTD and the input data — typically 2–3x on raw mzML arrays.