Determinism

SVGs are committed and reviewed as diffs, so the same input must give the same bytes on every machine.

Components

Pinned inputs

• Inter is bundled, so label widths never depend on installed fonts.
• std transcendentals can differ in the last bit across platforms, so every transcendental goes through libm; clippy.toml bans the std versions and the kurbo calls that use them.
• dagre-dgl-rs broke ties in HashMap order and numbered nodes from a global counter; svugy-dagre, cut down from it, breaks ties in a fixed order, keeps the counter per graph, and lets no HashMap order reach a coordinate (crates/svugy-dagre/README.md).
• Model and LevelPlans keep their entries in BTreeMaps, iterated in key order.

One output spelling: at most 3 decimals per number, attributes sorted.

Tests

• Snapshots pin both SVGs of examples/svugy/svugy.md and its static raster (crates/svugy/tests/golden_svugy.rs).
• 300 random graphs are each rendered twice and compared (crates/svugy/tests/determinism.rs).
• CI renders examples/svugy/svugy.d2 on Linux, macOS and wasm32-wasip1 and diffs each result against the committed docs/svugy.svg.