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`Tx.sign_input` should allow uncompressed pub key
Without the functionality of creating a ScriptSig with an uncompressed SEC for the public key, it is not possible to spend bitcoin sent to an address created from an uncompressed SEC.
I created an uncompressed address in Chapter 4 and had a testnet faucet send to it but then struggled to complete exercise 4 in Chapter 7, due to the Tx.sign_input method not having a "compressed" arg.