function checkMatchingSubtreeShape(a, b) {
  if (a.subdivisionScheme !== b.subdivisionScheme) {
    throw new DeveloperError("coordinates must have same subdivisionScheme");
  }
  if (a.subtreeLevels !== b.subtreeLevels) {
    throw new DeveloperError("coordinates must have same subtreeLevels");
  }
}
Check that the two coordinates are compatible
@param {ImplicitTileCoordinates} a
@param {ImplicitTileCoordinates} b
@private