What happens to deprecated/removed entries?

[funnelfiasco]

Mentioned by @eddie-knight in issue 88:

we should talk about (and document) what the project will do with an ID in the event that an entry is deprecated or removed after an official release. It will be cumbersome to users if an ID is reused for a different entry.

[funnelfiasco]

I can draft a PR for this in the next day or two. I don't think it needs a ton of discussion, so we can put together a draft and argue about it.

[david-a-wheeler]

In an early stage nothing special, but at some point deprecated/removed entries should have their IDs "reserved" so they're not reused. Otherwise someone who earlier claimed to meet something might suddenly be misunderstood as doing something else.

[puerco]

Agree whatever we use to tombstone them it should also signal any automation that the control is gone.

[eddie-knight]

Does anyone know how this has been done well elsewhere?

Perhaps we could clear all the keys except for id and add a new item signaling the removal?