This seems to work :)
#!/usr/bin/perl -l
use strict; # https://perlmonks.org/?node_id=11133064
use warnings;
my $template = 'd<';
my $nv = 2.4;
$nv = 4135; # NOTE errors for this number
my $p = pack $template, $nv;
use Data::Dump qw(pp);
my $s = pp $p;
print ">$s<\n";
system $^X, '-wle', "use strict; print unpack('H*', $s);";
Outputs:
>"\0\0\0\0\0'\xB0\@"<
000000000027b040
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