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Could you add a check verifying that after an invalidate wherestate == null, callingthis.state insidebuild doesn't throw?

I would expect that to fail with your current changes.

Not sure I understood that correctly, but did add a test that represents how I understood it.

The original implementation did cause that test to fail with an exception hinting at an uninitialized provider. With thehasValue: true check you proposed it does not throw an exception.

However, now aProviderObserver related test fails. Didn't really investigate it, but out of the box, I have no idea what might be the reason.