Elemental2 oddities

I'm switching to use Elemental2, and it's fantastic.  All the bindings I'll ever need.  A big thank you to all that created it!

There are some strange things though.  Like when setting up a WebGLRenderingContext, we need to pass WebGLContextAttributes.

However, doing:

WebGLContextAttributes contextAttributes = new WebGLContextAttributes();

compiles fine, but at runtime throws:

TypeError: $wnd.WebGLContextAttributes is not a constructor

I figured out I can do this instead:

WebGLContextAttributes contextAttributes = Js.uncheckedCast(JsPropertyMap.of());

But why can't I just use its constructor?  Am I doing something wrong?

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