I created yet another EIP for replay protection. This one protect all forks from replay, including minority-led hardfork.
Why not a precompile? This is doing more work than reading a field like the other set of block and transaction properties.
Even if it was the deciding criteria, we are talking here about just an extra comparison :
return blockNumber < valid(chainID)
where valid will fetch the blockNumber at which the chainID become invalid (0 if never part of the history of chainID) which is comparable to blockhash opcode
Thus, I still think it should be a simple opcode
Opcodes are a limited resource, so I feel we should be stingy in dishing them out.
Because this is more than echoing data from the VM container I feel the complexity merits elevating it to precompiled contract.
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Ok, that sounds reasonable. How does it affect gas cost though ?
I see that there is this EIP (https://eips.ethereum.org/EIPS/eip-1109) that make me think the gas overhead is minimal but what about today?
I edited the EIP to use a precompile.