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  1. or download this
    
            (?{ my $v = eval $^N;
                say $i x $l,"->have number $v" if TRACE_JSON; 
                push_val($v); })
          )
    
  2. or download this
    (?{ push_number( $^N, $depth ); })
    sub push_number {
    ...
    TRACE( $depth, $msg );
    
  3. or download this
              (?>(?&STRING)) # ratchet
              \s*+ # ratchet
                [^\\"]++ # ratchet
              )*+ # ratchet
              (?: 0 | [1-9]\d*+ # ratchet