$mdThemingProvider: extendPalette won't accept hex values with capital letters

[epelc]

I was getting this error for a while but I just figured out the colorToRgbaArray function doesn't accept any hex values with upper case letters.

Error

Uncaught Error: Color 15B374, in palette undefined's hue 500, is invalid. Hex or rgb(a) color expected.

Example

var neonRedMap = $mdThemingProvider.extendPalette('green', {
        // convert all upper case letters to lower case for this to work
        '500': '15B374'
    })