388193a67b
The behaviour of lerpDouble with respect to null inputs isn't entirely obvious. In the case where both inputs are null, it returns null. Otherwise, it defaults the null parameter to 0.0 and carries on. Post non-null by default, it might be nice to strengthen the parameter contract to require them to be non-null. While this would be a breaking change, it seems likely that the framework either meets this guarantee or can provide it without a framework breaking change. https://github.com/flutter/flutter/issues/64617 tracks the above. In the meantime, adding a test to lock in the current behaviour.
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