How to fix ugly radialGradient in FF?

Question

Canvas

I draw a sector with a radial gradient with a canvas. In chrome, everything is ok, in FF I get some kind of heresy, and it does not appear on all sector turning radii.

How to fix it?
JS Fiddle: https://jsfiddle.net/Arris/s2qvsd73/
PS FF 55, Win7

Answer 1

Of course, the answer was found only on StackOverflow .
I quote:

The error is due to an error converting the coordinates of the gradient from double to float and can be fixed by forcing the radial gradient coordinates to be Int32s
Bitwise or with 0 will convert from JS Number to Int32 (signed integer 32bits) and fix the problem .

var gradient = ctx.createRadialGradient(
    grad_x0 | 0, 
    grad_y0 | 0, 
    options.radius | 0, 
    options.x0 | 0, 
    options.y0 | 0, 
    0
);