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#
#    my $ref = ref($val);
#    if ($ref eq '') {
#        if (!defined($val)) {
#            return "undef";
#        } elsif (looks_like_number($val) && !$OPT_STRINGIFY_NUMBERS &&
#                     # perl does several normalizations to number literal, e.g.
#                     # "+1" becomes 1, 0123 is octal literal, etc. make sure we
#                     # only leave out quote when the number is not normalized
#                     $val eq $val+0 &&
#                     # perl also doesn't recognize Inf and NaN as numeric
#                     # literals (ref: perldata) so these unquoted literals will
#                     # choke under 'use strict "subs"
#                     $val !~ /\A-?(?:inf(?:inity)?|nan)\z/i
#                 ) {
#            return $val;
#        } else {
#            return _double_quote($val);
#        }
#    }
#    my $refaddr = refaddr($val);