Effective gas price is the smaller of base fee + tip limit vs total fee limit.

IsValidInt256 check the bound of 256 bit number.

Convert a value with the provided converter and set it using the provided setter.

address is validate if it is a hex string (case insensitive) of length 40.

validate a ethtypes.Transaction for sdk.Int overflow.

Unfortunately `TxData` interface in go-ethereum/core/types defines its functions as private, so we have to define our own here.