[erkancamli]

createNonceManager remembers the last nonce it handed out, so that a source which has not caught up yet (eth_getTransactionCount at pending before the previous transaction is broadcast or seen by the node) does not get the same nonce again:

const previousNonce = nonceMap.get(key) ?? 0
if (previousNonce > 0 && nonce <= previousNonce)
  return previousNonce + 1

A missing entry defaults to 0 and the guard is > 0, so a consumed nonce of 0 looks the same as "nothing consumed yet". For an account with no transactions, the next consume() against a source that still says 0 hands out 0 again. Every other account gets n + 1.

Repro:

const nonceManager = createNonceManager({ source: { get: () => 0, set() {} } })
await nonceManager.consume(args) // 0
await nonceManager.consume(args) // 0, expected 1

With get: () => 5 the same calls return 5, 6.

The existing prepareTransactionRequest "behavior: nonce manager" test shows the flow: prepare twice, then three in parallel, giving 953 to 957 for the fork account. The same steps against a local anvil for an account at nonce 0 give [0, 0, 0, 1, 2] on main and [0, 1, 2, 3, 4] with this change. With a transport whose pending count lags, three sequential sendTransaction calls from a fresh account broadcast nonces [0, 0, 0] (the same mock at count 5 gives [5, 6, 7]).

This PR compares against undefined instead of 0, which is the change v3 already has in NonceManager (87b581c).

Tests: src/utils/nonceManager.test.ts adds a stale source case that fails on main (expected +0 to be 1) and passes with this change. The rest of the file passes on both (run against a local anvil). A changeset is included.

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Latest commit: 58f26de

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