Props types cleanup

@mattdamon108 I have a question regarding props types:

Why are domProps and props as defined in

Line 58 in d5d9168

type domProps = {

and

Line 1085 in d5d9168

type props = {

still @deriving(abstract) types and not just

type props = JsxDOM.props type domProps = JsxDOM.domProps

?

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