Foundry fork mode base-fee calculation shifts from mainnet historical to internal simulator after fork block
Context Teams adopting Foundry fork mode (v0.2.0+) for integration testing against mainnet state without production credentials rely on vm.createFork to replay historical blocks via eth_call . The fork inherits the parent chain's block.basefee at the fork block, but subsequent base-fee updates follow Foundry's internal EIP-1559 calculator instead of mirrorin
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