v0.0.31 Odd I am cutting with a box to see the inside structure of the subtraction #51

import {
  axis, circle, extrude, plane, rect,
  revolve, rotate, sketch, subtract, translate,
} from 'fluidcad/core';

function makeTubeProfile() {
  circle(20);
  circle(10);
}

const a = axis('y', { offsetZ: 20 });
const ax = axis('x', { offsetZ: 20 });

sketch('yz', makeTubeProfile);
let t1;
t1 = revolve(a).new().name(' t1');
t1 = translate([0, 5, 0], t1);

sketch('yz', makeTubeProfile);
let t2;
t2 = revolve(a).new().name(' t2');
t2 = rotate(ax, 37, t2);

const o1 = subtract(t1, t2).name(' o1');

let cutter;
cutter = sketch(plane('xz', { offset: -2 }), () => {
  rect(70, 120).centered();
});
cutter = extrude(20, cutter).new();

subtract(o1, cutter);