Change in API behavior now breaking my app

[Jonathan C]

Until recently, the API GET /:urlname/events/:id/attendance

had two parameters, "member" and "filter" so the attendance of a single person could be requested, or a subset based on RSVP.

Now these seem to be gone, and the API always responds with everyone who RSVP'd.

Really, such a major change of the API behavior should require a version change to avoid breaking existing apps.

Grrrr... I will work around this, but poor behavior by Meetup, IMHO.