svg tag viewBox becomes viewbox

[oceangroove]

In HiccupRepresentable and HickoryRepresentable if the node type is Attribute then lower-case-keyword is applied.
However, from

https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute

some svg tags have uppercase characters like viewBox (there are others). This causes a warning in both Chrome and Firefox under re-frame (originating from react) but is not in itself an error in either browser. ie, an svg image with viewbox does not cause a warning.

Example warning:
react-dom.inc.js:82 Warning: Invalid DOM property viewbox. Did you mean viewBox?

re-frame 1.2.0 cljs 1.10.516

[port19x]

In select.cljc, the function attr is responsible for that lowercase conversion.
A patch would be trivial.
The code is commented with a link to the html spec, which alledgedly states that an html5 parser should always normalize to lowercase.