RngState Type
Opaque pure RNG state (the xorshift64 stream word). Carry it through your `Model`; thread it with `nextRng`/`nextBelow`. The representation is `private` — construct it only via `seedRng`, advance it only via `nextRng`/`nextBelow`.
Record fields
| Record Field |
Description
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Full Usage:
State
Field type: uint64
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