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?
Combined from primary sources listed below.

In Operators§

See primary documentation in context for prefix ?. 

multi prefix:<?>(Mu --> Bool:D)

Boolean context operator.

Coerces the argument to Bool by calling the Bool method on it. Note that this collapses Junctions.

In enum Bool§

See primary documentation in context for prefix ?. 

multi prefix:<?>(Mu --> Bool:D)

Coerces its argument to Bool.