leak in fabric when a big canvas with one little image.

index.js

const { fabric } = require('fabric');

// const m = () => process.memoryUsage();
const m = () => (process.memoryUsage().rss / 1000000 | 0);

console.log('START ', m());

for (let i = 0; i < 3; i++) {
  const canvas = new fabric.StaticCanvas();
  canvas.setWidth(10000);
  canvas.setHeight(10000);

  let obj = {
    type: 'image',
    version: '2.0.0-rc.3',
    originX: 'left',
    originY: 'top',
    left: 0,
    top: 0,
    width: 1,
    height: 1,
    fill: 'rgb(0,0,0)',
    stroke: null,
    strokeWidth: 0,
    strokeDashArray: null,
    strokeLineCap: 'butt',
    strokeLineJoin: 'miter',
    strokeMiterLimit: 10,
    scaleX: 1,
    scaleY: 1,
    angle: 0,
    flipX: false,
    flipY: false,
    opacity: 1,
    shadow: null,
    visible: true,
    clipTo: null,
    backgroundColor: '',
    fillRule: 'nonzero',
    paintFirst: 'fill',
    globalCompositeOperation: 'source-over',
    transformMatrix: null,
    skewX: 0,
    skewY: 0,
    crossOrigin: '',
    cropX: 0,
    cropY: 0,
    src: 'https://imgflip.com/s/meme/Leonardo-Dicaprio-Cheers.jpg',
    filters: [],
    selectable: true
  };


  // UNCOMENT NO LEAK
  // obj = {};

  canvas.loadFromJSON({ version: '2.0.0-rc.3',
    objects:
     [ obj,
        ] }, () => {
          const dataUrl = canvas.toDataURL({ format: 'png' });
          canvas.dispose();
          global.gc();
          console.log('IMG' + i + ' ', m());
        });
}

console.log('END ', m());

setInterval(() => {
  global.gc();
  console.log('RSS ', m());  
}, 1000);