I noticed you removed "Hash keys must be strings." and changed this to use symbol keys. Do you know if that's now the intended behaviour? (e.g. is there a commit I can reference?)

I know you probably tested that it works now, but there's a difference between "the implementation changed and this happens to work now, but we have no intention to formally support this" and "we now support this but forgot to update the docs", so I want to find out which is which. Can you investigate? :)