low memory issues with a multicock variant

It looks to me that watches tells you what you have bound to the Buttons.
Below is the result of my stepo watch, which detects press and release of BTN2.

global["\xFF"].watches
=[
  undefined,
  { pin: D22, recur: true, debounce: 26214, edge: 1,
    callback: function () { ... },
    state: false },
  { pin: D22, recur: true, debounce: 26214, edge: -1,
    callback: function () { ... },
    state: false }
 ]
>

Below is the result of my experimental multiclock where I want to have {BTN1, BTN2} short and long presses passed onto the current watch face. I use BTN3 rising edge to switch faces and leave BTN3 long press for the reset.

>global["\xFF"].watches
=[
  undefined,
  { pin: D24, recur: true, debounce: 26214, edge: 1,
    callback: function (btn) { ... },
    state: false },
  { pin: D22, recur: true, debounce: 26214, edge: 1,
    callback: function (btn) { ... },
    state: false },
  { pin: D23, recur: true, debounce: 26214, edge: 1,
    callback: function () { ... },
    state: false, lastTime: 1615420296.37918376922 },
  { pin: D24, recur: true, debounce: 26214, edge: -1,
    callback: function (btn) { ... },
    state: false },
  { pin: D22, recur: true, debounce: 26214, edge: -1,
    callback: function (btn) { ... },
    state: false }
 ]

So these are both what I would expect.

  setWatch(btn_pressed.bind(null,1), BTN1, {repeat:true,edge:"rising"});
  setWatch(btn_pressed.bind(null,2), BTN2, {repeat:true,edge:"rising"});
  setWatch(nextFace, BTN3, {repeat:true,edge:"rising"});

  setWatch(btn_released.bind(null,1), BTN1, {repeat:true,edge:"falling"});
  setWatch(btn_released.bind(null,2), BTN2, {repeat:true,edge:"falling"});
  // BTN 3 long press should always reset the bangle