These docs are under active development and cover the v0.20 Kobicha security model.
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§3.2

Comparison

§3.2.1 Equality

Two LUIDs are equal if and only if both their LowPart and HighPart fields are identical.

§3.2.2 Ordering

This specification does not define a total ordering for LUIDs. Although LUIDs are allocated monotonically within a boot session (see §3.3), consumers MUST NOT rely on numeric ordering to infer temporal relationships between LUIDs obtained from different contexts.