dist/cytoscape.esm.js
function setupShapeColor() {
    var bgOpy = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : bgOpacity;
    r.eleFillStyle(context, node, bgOpy);
  }
function setupShapeColor() {
    var bgOpy = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : bgOpacity;
    r.eleFillStyle(context, node, bgOpy);
  }
function setupShapeColor ( ) { var bgOpy = arguments . length > 0 && arguments [ 0 ] !== undefined ? arguments [ 0 ] : bgOpacity ; r . eleFillStyle ( context , node , bgOpy ) ; }
so borders are square with the node shape
so borders are square with the node shape