function isCurveArray(path) {
  // `isPathArray` also checks if it's `Array`
  return isNormalizedArray(path) && path.every(([pc]) => 'MC'.includes(pc));
}
Iterates an array to check if it's a `pathArray`
with all C (cubic bezier) segments.

@param {string | SVGPath.pathArray} path the `Array` to be checked
@returns {boolean} iteration result