Aligning Views and Flexible Sizing
It is supremely easy to align views with constraints:
The four format strings "H:|[self]", "H:[self]|", "V:|[self]", and "V:[self]|", respectively, produce left, right, top, and bottom alignment.
Add a predicate with a sizing relation, and these format strings become stretch to left, stretch to right, and so on: "H:|[self(>0)]", "H:[self(>0)]|", "V:|[self(>0)]", and "V:[self(>0)]|".
A second vertical pipe adds ...
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