getSvgPathFromPoints

SVG path data through a list of points.

With closed, the path is closed with Z, which is not the same as repeating the first point: only Z makes the join at the start a proper corner rather than two overlapping line caps.

Coordinates are rounded to two decimals. At canvas scale that is far below a device pixel, and it keeps an exported path from being three times longer than it needs to be because of float dust.