RxAnimated
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NSLayoutConstraint
https://github.com/RxSwiftCommunity/RxAnimated/blob/b499e2b8173ad49b0606c94aed4025d461ec70f1/RxAnimated/Core/RxAnimated%2Bbindings.swift#L126
Why firstItem
must be UIView
?
When your firstItem is safeArea, you don't pass the guard.