anvil --optimism functionality

[HrikB]

What exactly does the optimism flag do? I haven't noticed a change in the tx receipt structure or code at the predeploys.

[thebraveman17]

The Foundry docs only have this:

--optimism
          Run an Optimism chain
          
          [aliases: optimism]

[zerosnacks]

The --optimism flag exists to enable Optimism specific functionality which includes transaction types like DepositTransaction and enables the setting of hardforks specific to Optimism.