BorderWidth of Arch Element

[Prady2001]

so each arch element has a border right,
i labelled them 1,2,3,4
i have been going through the code which constructs there 4 borders, can anyone help me find them

[Prady2001]

not possible remove the border as it strokes the element as a whole ??

[LeeLenaleee]

Place where border gets drawn is here:

Chart.js/src/elements/element.arc.js

Line 222 in 4a9f446

function drawBorder(ctx, element, offset, spacing, endAngle) {

Border can be hidden by setting borderWidth to 0