Handle boolean attributes like hiccup does. #11
Merged
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Hiccup treats attributes with boolean values specially: it drops attributes like {:foo false}, and rewrites attributes like {:foo true} to foo="foo". This pullreq changes crate to behave the same way.
This is necessary for things like select-options to work correctly, as they are implemented with the expectation of this special behavior.
Note that this pullreq supersedes the more short-sighted #9 , which fixed the symptom in select-options, instead of the underlying problem.