Disable date given an arbritrary test function

[oishiimsg]

Ive been reading through the documentation and can't seem to find what I'm looking for.

Is it possible to disable a given date using an arbitrary test function?

I know there is the validRange prop which can take a startDate, endDate, as well as an array of dates to disable. But what if we want every date that meets some specific requirement to be disabled? For example, every 3rd day of the month, or specific days of the week (e.g. Saturdays and Sundays etc...).

Is this possible already and I'm just missing on how to configure it?