Class PeerSet

We can't use PeerIds as set entries because set entries are compared using same-value-zero equality, so this is just a map that stringifies the PeerIds before storing them.

PeerIds cache stringified versions of themselves so this should be a cheap operation.

Example

import { peerSet } from '@libp2p/peer-collections'

const set = peerSet()
set.add(peerId)
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