fix(EIP712): do not allow extraneous attributes

[freemanzMrojo]

Added a test with what I mean, title is self-explanatory.

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[freemanzMrojo]

Hi @jxom , hope you had a good weekend!

Please, let me know if I should do something else, thanks!

[freemanzMrojo]

Hey @jxom , hope you are doing well! If you think I should close this PR, please let me know 🙏 . Thanks!