Module ids 

Identifier newtypes.

InstanceId and EntityId wrap NonZeroU64 — zero is structurally unrepresentable, eliminating sentinel-value traps. Tick, TypeCode, RouteId wrap plain primitives because zero is a meaningful value for all three (origin tick; type/route zero is reserved for “unassigned” debug placeholders only and is not a sentinel).

Structs

EntityId

Per-instance entity handle. Non-zero.

InstanceId

Instance namespace handle. Non-zero to reject sentinel usage at the type level.

RouteId

Stable dispatch identifier for an action route. Registry interns string names into RouteId at registration; kernel internal dispatch uses RouteId only (“string-free dispatch”).

Tick

Deterministic logical time. Monotonic non-decreasing across step() boundaries of an instance. Zero is the origin tick.

TypeCode

Stable dispatch identifier for a registered Action/Component/Event type. Assigned monotonically at register_module and bound to a schema_hash for the lifetime of the world (TypeCode cross-restart persistence).