This looks like a great package! I was wondering if you could clarify how this compares with the older webdriver package. It looks like this package is more directly aimed at complying with the W3C spec, and has a different API design (monad transformer vs. typeclass). I see there's a brief mention of webdriver in the README but it would be super helpful if you could say more about this package's motivation/differences/when to choose one versus the other. Thanks!