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This likely needs to be tested on specific Gradle versions you wish to support, as there have been issues with Map/List/SetProperty re: providers, and recent improvements to null handling in providers.

Were there really improvements?
If you think about <https://github.com/gradle/gradle/issues/13364>, that was just closed as duplicate of <https://github.com/gradle/gradle/issues/20266> which is still open. So most probably still the whole `MapProperty` will be unset if one of the elements is unset.

I don't see how the `MapProperty` issue cited would be a dupe of the `HasMultipleValues` other than "they are semantically similar". I just fear that fixing one might not fix the other. But it's clear that using `put()` to conditionally add a mapping via absent provider might be counterproductive even if the docs say that it can be done.

When it comes to `MapProperty`, my fear is that I end up with some jank that boils down to
```val property: MapProperty&lt;String, String&gt;
property.put("foo", property.getting("foo").map { ... }.orElse(...))```
It haunts me at night.