Great to hear. This caused me troubles in the past because there were often 
two calls to xxxChanged at startup when run in JavaScript 
while in Dart there was only one such call.


> Recently we decided to also prevent transitions between undefined and null 
> from being reported as `*Changed`. It's true this is a lossy change, but it 
> prevents a lot of unwanted side-effects at construction time where various 
> properties tend to be in either state, but are almost always indicative of 
> an _uninitialized_ state.
>
>
>

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