do not perform lookups unless opted in

[zzmp]

The passed provider may provide a way to do ENS lookups, but if it does not, no lookups should be performed unless the integrator opts in. This prevents data/privacy leaking.

[zzmp]

@davatar/react makes calls to alchemy for ENS resolution on chainIDs besides 1, 3, 4, 5 (code).

[carlosdp]

I'm not sure I understand, what's the leak vector here? This library looks up ENS on mainnet (unless on a testnet with ENS deployed, where we assume we want to test with an ENS on that chain), which should be the correct behavior, even if the "connected" chain is a different one (say Polygon).