Enum Evidence 

pub enum Evidence {
    Fast,
    Quorum,
    Full,
}

How much relay coverage a fetch waits to witness before returning.

The community planes distinguish POSITIVE DATA (signed events, hash-chained editions — safe to act on from any relay; refuse-downgrade floors make stale or replayed data harmless) from NEGATIVE VERDICTS (conclusions from absence: “no rotation happened”, “history ends here”, “coverage complete”). A partial relay view can only ever STALL consensus — and every stall heals via the straggler sink, the live subscription, or the next sync — but a written negative verdict has no healer. Pick the tier by what the caller CONCLUDES from the result, not by how fast it wants to be.

Variants

Fast

Return at the FIRST successful relay EOSE (+ the residual merge window). For positive-data consumers only: never conclude absence from a Fast result.

Quorum

Wait for a MAJORITY of attempted relays — time-bounded to QUORUM_GRACE_MS past the first success, so one dead relay can’t gate a degraded set. A single fast-lying relay can’t force an early return while its honest peers answer within the window. Note: for a 2-relay set the majority is BOTH, so a degraded pair always rides the grace bound (first success + 2s), never a dead relay’s full timeout.

Full

Wait for EVERY relay to resolve (EOSE or its per-relay timeout). For presence-latches and coverage gates whose correctness depends on the union being as complete as the reachable set allows. Forced whenever Query::until is set (back-page verdicts).

Trait Implementations

impl Clone for Evidence

fn clone(&self) -> Evidence

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Evidence

impl Debug for Evidence

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Evidence

fn default() -> Evidence

Returns the “default value” for a type.

impl Eq for Evidence

impl PartialEq for Evidence

fn eq(&self, other: &Evidence) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Evidence