gistfile1.txt

// confusing (a bit), but clear from the return type
user.ban(Period period); // void
user.ban() // return s ban

// solution:
user.currentBan();

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### V1
Authentication authentication = new Authentication(credentials);
authentication.token() throws ...

### V2
AuthenticationToken token = new AuthenticationToken(credentials) // throws...

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Suppliers.memoize(vault::verySecure);

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users.sort(comparing(User::getId));


nickName
        .map(nick -> firstName + " <" + nick + "> " + lastName)
        .orElse(firstName + " " + lastName)