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dart - Flutter null-safety migration

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dart - Flutter null-safety migration

When I use the dart migration tool, it suggests that casting for builder of AnimatedBuilder:

Added a cast to an expression (non-downcast)

Is this really necessary?

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与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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