gpx-rs

The GPX engine: plain Rust, no knowledge of who uses it. Tested natively with cargo test (from here or from the root).

src/core, src/engine, src/storage: the engine itself.
src/api: the interface to the engine that the frontends (../wasm, ../tauri) share. Each function takes the engine and typed arguments, and gives plain data (api::dto, serde types, or slices for the numeric buffers). A frontend only converts what crosses: ids from strings or bytes, results to JS objects or JSON, slices to typed arrays or raw bytes.