Invalid permit signature generated with MetaMaskWallet signAmino

[luca992]

When I use metamask to try and generate a permit. I'm getting "Failed to verify signatures for the given permit" when trying to use the permit.
I think it might have to do with pretty printing the json before converting to hex:

secret.js/src/wallet_metamask.ts

Line 113 in 898529e

const msgToSign = `0x${toHex(prettySerializeStdSignDoc(signDoc))}`;

Which would make the computed hashes different when the signature is generated, I would think.

[assafmo]

Permits are not supported with MetaMask at the moment. I have a workaround but it's ugly 🤔