`arrow.now().dehumanize("1 day ago").isoformat()` doesn't work. `arrow.now().dehumanize("1 days ago").isoformat()` does work. Same with `week`, `month`, and `year`.
arrow.now().dehumanize("1 day ago").isoformat()doesn't work.arrow.now().dehumanize("1 days ago").isoformat()does work.Same with
week,month, andyear.