perf: lazily serialize peer to avoid hot-path allocations #16028
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This change removes the unconditional ENR serialization in compareForkENR and makes it lazy-only for logging/error paths with a safe fallback to peer.String(). The function is invoked in the discovery hot path via filterPeer, so doing a base64+RLP encode for every candidate—even for the common match case—wastes CPU and allocations. Other call sites serialize ENR strings only when needed (e.g., RPC responses), so this aligns with established patterns. The core compatibility checks remain unchanged; we simply avoid failing the function due to an auxiliary logging serialization failure.