Documentation for infix ?& assembled from the following pages:
Language documentation: Operators §
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(Operators) infix ?& §
multi sub infix:<?&>(Mu = Bool::True)multi sub infix:<?&>(Mu \a, Mu \b)Boolean logical AND operator. Coerces the argument(s) to Bool and performs logical AND on it(them): it will return True if and only if both arguments are True. On a single argument it behaves as identity, returning the coerced value.