Why do claim need to have binary keys?

[anthonator]

The claims/0 spec is defined as claims() :: %{required(binary()) => term(). I'm curious why the claims you pass into Joken functions need to have binary keys. It also works with atom keys but dialyzer fails.

[victorolinasc]

This is probably just because claims are JSON data and that is how JSON libraries usually encode to the format. Nothing really "needed" but thought of as a good practice when dealing with JSON in general.

Do you have a particular use case that atom keys would be a nice fit?