I don't like code to casually access the inner dict. Now you have to maintain your `k != 'self'` (ugly in its own right) for each argument you want to exclude f

I don't like code to casually access the inner dict. Now you have to maintain your `k != 'self'` (ugly in its own right) for each argument you want to exclude from this rule. The explicit version is superior, this is needlessly slow and complicated.