zonedDateTimeFns.until() does not handle reversable differences correctly

[kolton-musgrove]

    const earlier = zonedDateTimeFns.from('1976-11-18T15:23:30.123-03:00[America/Santiago]')
    const later = zonedDateTimeFns.from('2019-10-29T10:46:38.272-03:00[America/Santiago]')
    // The interchangeability of since() and until() holds for time units only
    const units: TemporalPluralUnit[] = ['hours', 'minutes', 'seconds']
    units.forEach((largestUnit) => {
      const diff = zonedDateTimeFns.since(later, earlier, { largestUnit })
      it(`zonedDateTimeFns.since(earlier, later, ${largestUnit}) == zonedDateTimeFns.since(later, earlier, ${largestUnit}).negated()`, () =>
        assert.equal(zonedDateTimeFns.since(earlier, later, { largestUnit }), durationFns.negated(diff)))
      it(`zonedDateTimeFns.until(earlier, later, ${largestUnit}) == zonedDateTimeFns.since(later, earlier, ${largestUnit})`, () =>
        assert.equal(zonedDateTimeFns.until(earlier, later, { largestUnit }), diff))
      it(`zonedDateTimeFns.subtract(${earlier}, durationFns.negated(${diff})) == ${later}`, () => {
        assert.equal(zonedDateTimeFns.subtract(earlier, durationFns.negated(diff)), later)
      })
      it(`zonedDateTimeFns.add(${later}, durationFns.negated(${diff})) == ${earlier}`, () => {
        assert.equal(zonedDateTimeFns.add(later, durationFns.negated(diff)), earlier)
      })
    })

actual: '2019-10-31T04:09:58.123-03:00[America/Santiago]'
expected: '2019-10-29T10:46:38.272-03:00[America/Santiago]'

The first two asserts are correct, but the third and fourth fail on hours, minutes, and seconds.