pub(super) const ABSENT_SOURCE_ID: u32 = 0xFFFF_FFFF;Expand description
Absent marker for the two source ids. Mirrors ABSENT_SOURCE_ID in
packages/cache/src/sections/geometry.ts.
A REAL collision, taken deliberately: #4294967295 is a legal instance name
(fast_parse_tests.rs:57 asserts u32::MAX parses; step_tests.rs:436
writes one), so a mesh sourced from exactly that id loses its drill target.
The alternatives are worse: 0 is reachable, a nullable column leaks the
neighbouring row’s id on parquet-wasm 0.7.x, and presence columns cost two
per row to disambiguate one value in 4.29 billion.