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