Rounds down values in SVG path

round-svg-path.js

function round(value, decimals) {
  return Number(`${Math.round(`${value}e${decimals}`)}e-${decimals}`);
}

function roundPath(path, decimals = 3) {
  function roundPathPoint(pathPoint) {
    function roundPathPointElement(pathPointElement) {
      if (pathPointElement.match(/^[A-Za-z]/)) {
        return `${pathPointElement[0]}${pathPointElement.slice(1) && round(pathPointElement.slice(1), decimals)}`;
      }
      return round(pathPointElement, decimals);
    }

    const pathPointElements = pathPoint.split(',');
    return pathPointElements.map(roundPathPointElement);
  }

  const pathPoints = path.split(' ');
  return pathPoints.map(roundPathPoint).join(' ');
}

Good catch @andrewsmallbone. Updated :)