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  BEGIN {
      eval 'require Scalar::Util';
      unless($@){
          *JSON::PP::blessed = \&Scalar::Util::blessed;
          *JSON::PP::reftype = \&Scalar::Util::reftype;
          *JSON::PP::refaddr = \&Scalar::Util::refaddr;
      }
      else{ # This code is from Sclar::Util.
          # warn $@;
          eval 'sub UNIVERSAL::a_sub_not_likely_to_be_here { ref($_[0]) }';
          *JSON::PP::blessed = sub {
              local($@, $SIG{__DIE__}, $SIG{__WARN__});
              ref($_[0]) ? eval { $_[0]->a_sub_not_likely_to_be_here } : undef;
          };
          my %tmap = qw(
              B::NULL   SCALAR
              B::HV     HASH
              B::AV     ARRAY
              B::CV     CODE
              B::IO     IO
              B::GV     GLOB
              B::REGEXP REGEXP
          );