Signature Type as an EIP standard

Hey all, we’re looking at how WalletConnect DApps can know when a signature was signed on behalf of a wallet contract by its owner address (so that a DApp can verify a signature accordingly via EIP-1271). Looking at solutions, we noticed that 0x uses a “Signature Type” byte appended to the end of a signature to inform the 0x contracts how the signature was signed.

Has this “Signature Type” mechanism been standardised via EIP? Are there plans to do so at all?

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We have now posted this as an EIP -> https://ethereum-magicians.org/t/erc-2126-signature-type-recognition/3392

Started a draft on hackmd

https://hackmd.io/@UOhxvY-JR5-hS5YntDUsGQ/HJE1SjPyB/edit