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Combined from primary sources listed below.

In enum Bool§

See primary documentation in context for prefix ? 

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

Coerces its argument to Bool.

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.