Module fidelity 

Structs

FidelityReport

What a read cost in fidelity. Returned alongside data, never logged and discarded — the caller must be able to discover what was approximated.

MetaFields

Which metadata fields are missing. true means absent, not present.

Enums

Fidelity

One specific, structured thing that was lost or approximated.

Rung

Which rung of the adaptive stream ladder a read landed on.