ORMergeHives - public documentation?

[brian-man]

Is there any public documentation (existing or intended) for ORMergeHive?

Specifically, I'm interested in how key and value deletes are represented in the deltaHive referenced in internal/wclayer/cim/registry.go's mergeHive() function.

From directed testing with a narrow test case, it looks like for values a zero-sized REG_NONE is used but I'm unclear how that is distinguished at merge time from the adding / modifying of a value of the same form.

Thanks