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  1. or download this
    my $json = {
    'book' => {
...
$json->{'book'}{'pages'} += 0;
my $string2 = encode_json($json);
print "After numify: $string2\n";
  2. or download this
    5.03
After printing: {"book":{"title":true,"pages":"5.03"}}
After numify: {"book":{"title":true,"pages":5.03}}