Typed-data signing
Signing structured Ethereum messages using a format such as EIP-712.
In more detail
Typed data gives fields names and types, and adds domain information identifying the signing context. This can make a permit or another authorization easier to inspect than raw bytes. It improves representation, but a neatly formatted message can still grant permission you did not intend to give.
How you might use it
Your wallet displays the spender, amount and deadline as readable EIP-712 fields instead of presenting only opaque bytes.
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