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What do you mean with "can have a null string"?
If you set it to `null`, the convention value is used.
If there is no convention value or you set it to `provider { null }`, the provider has no value and gives an exception if you query it for its value.
(This inconsistency is topic of <https://github.com/gradle/gradle/issues/14768> btw.)

What I mean is `Property&lt;String&gt;` is like Java development (at least old versions). You get the null in runtime if you don't do manual checks with `if` or whatever.

I would like to have null safety to ensure a property cannot be null, currently you can

```val someProp: Property&lt;String&gt; = objects.property&lt;String&gt;().convention() // you don't set any value```
And it will crash, but it shouldn't compile.

Based on that issue, what I mean is, the next snippet shouldn't compile in some situation where `null` must not be valid, only if explicitly the type is `String?` (or there is a `NullableProperty`)

```someProperty.set(null)```

And `restoreConvention` is the way I would choose so in the future we can have null safety on properties

Setting to `null` does not set it to `null`, it sets it to the convention or to unset if there is no convention. You can chain providers, so that if it is unset a different provider is evaluated and so on. No provider can have a `null` value currently. 

And regarding "is like Java development", well, it *is* Java development. It is a Java class.