// By contract, sequence can't be empty and should contain at least
// one element.
function is_asc_sequence(sequence) {
  let prev = sequence[0]
  let exit = false

  let rv = sequence.some((_, index, sequence) => {
    if (index >= 1) {
      const current = sequence[index]

      if (current < prev) {
        if (exit)
          return true
        exit = true
      }

      prev = current
    }
    return false;
  })

  return !rv
}