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            Return a bool pointer if
            this is a boolean, else return nullptr
          
bool const* if_bool() const;
            If this->kind() == kind::bool_,
            returns a pointer to the underlying boolean. Otherwise, returns nullptr.
          
The return value is used in both a boolean context and to assign a variable:
if( auto p = jv.if_bool() ) return *p;
Constant.
No-throw guarantee.