What does Ambiguity mean in terms of Content Compression Resistance Priority?

What does the Ambiguity setting mean under Content Compression Resistance Priority of a view? I can't seem to find the explanation using Google.

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From https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/AutolayoutPG/AnatomyofaConstraint.html


"Ambiguous constraints have more than one possible solution."