What does 'unstable' mean?

[hayer]

I see in the README.md that ansibleguy.opnsense.unbound_acl, and others, are marked as "unstable".
What does this mean? Are there any specific details on the different items and why they are marked as unstable?
I would love to help make them stable.

[superstes]

Greetings.

These are the development states:

not implemented => development => testing => unstable (practical testing) => stable

Unstable = Module is working but may still have issues for edge cases.

The state is basically set to stable if no issues are reported over some months.