<Kotlin Contracts not working for null-check in ex...

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Kotlin Contracts not working for null-check in extension function
I'm trying to write an extension function that returns true if the value is not null or 0 and use a contract to guarantee to the compiler that if I return true, the value is non-null. However, it doesn't seem to be working with smart casting. It still won't compile when I try to pass the value into a function that takes a non-nullable Long.
I tried to compile this code and it would not work. I expected the id to be smart-casted to a Long from a Long? since the contract guarantees that if...