Common boundaries
The wire format, feature gates and primitives both directions share.
| Specification | Scope |
|---|---|
| Frame format | Magic, frame header, chunk header lanes, stream numbering, stored streams, checksums and limits as both codecs read and write them. |
| Codec features | Direction and per-codec feature gates, std/no_std, libm and profiling features, and how disabled codecs behave. |
| Shared primitives | Varints, bit packing, wire constants, XXH3 with its SIMD accumulator, and the encoder-side shared modules. |
| Uninitialized output | compress_to_uninit, decompress_to_uninit and process_uninit: BorrowedBuf sinks, zero-free Vec decoding and their Miri/ASan coverage. |