Scattergl marker color behaves unexpectedly when specified as TypedArray

[jonmmease]

Last one for today I promise!

When I set the marker.color property of a scatter trace to a numeric TypedArray, the color is computed based on the numeric values in the array and the marker's colorscale.

TESTER = document.getElementById('tester');

Plotly.plot( TESTER, [{
 "type": "scatter",
 "mode": "markers",
 "y": [1, 2, 3],
	 "marker": {
		 "size": 20,
		 "colorscale": [[0, 'gray'], [1, 'red']],
		 "cmin": 0,
		 "cmax": 1,
		 "showscale": true,
		 "color": new Float32Array([0, 0.5, 1.0])
	 }
 }], {"width": 500});

But, when I do the same thing using a scattergl trace, a color is chosen that's not in the specified colorscale

TESTER = document.getElementById('tester');

Plotly.plot( TESTER, [{
 "type": "scattergl", // <--- Change here
 "mode": "markers",
 "y": [1, 2, 3],
	 "marker": {
		 "size": 20,
		 "colorscale": [[0, 'gray'], [1, 'red']],
		 "cmin": 0,
		 "cmax": 1,
		 "showscale": true,
		 "color": new Float32Array([0, 0.5, 1.0])
	 }
 }], {"width": 500});

Codepen: https://codepen.io/anon/pen/LmbQdv

Note: The colors for the scattergl trace display propery if the marker.color propery is set to a standard (non-typed) array.