Setting sensitive flag from mastodon.py returns 400 error

It started about 4 days ago on develop. When setting the sensitive flag I'd get the error Mastodon API returned error', 400, 'Bad Request', 'sensitive - Invalid boolean. Got: string. However, a bool was sent as far as I could tell. @Dielan was getting the error with his bots and I was able to reproduce the same error. I reverted back to 2b18b8a2 and the problem went away. Not exactly sure which commit it was as the problem went unnoticed for a few days.