use TransmissionValue;
use Arc;
/// Reclaims an owned `TransmissionValue` from a batch shared across a fan-out send: free
/// when this is the last reference, a clone otherwise. This is what makes sharing a batch
/// across receivers (instead of deep-cloning it once per receiver) pay off — the clone
/// cost, when unavoidable, is deferred to whichever receiver actually needs its own copy.
pub