Forgive me if I have overlooked some documentation on this.

Looking at the YAML 1.1 spec, I see that anything matching this regexp:

 y|Y|yes|Yes|YES|n|N|no|No|NO
|true|True|TRUE|false|False|FALSE
|on|On|ON|off|Off|OFF
[download]

is considered a boolean.

I have the following structure in my .yaml file:

-
  name: Bob Johnson
  active: true
  happy: false
-
  name: Bill Johnson
  active: true
  happy: true
-
  name: Frank Johnson
  active: false
  happy: false
-
  name: George Johnson
  active: false
  happy: true
[download]

I have the following code:

#!/usr/bin/env perl          
use strict;                  
use warnings;                
use YAML::XS qw(LoadFile);                                
use Data::Dumper;            
                             
my $data = LoadFile('/tmp/test.yaml');
print Dumper($data);
[download]

The code for YAML::Syck is the same other than the fact that I am using YAML::Syck rather than YAML::XS.

Here are the results from each:

YAML::XS

$VAR1 = [
          {
            'name' => 'Bob Johnson',
            'active' => 1,
            'happy' => ''
          },
          {
            'happy' => ${\$VAR1->[0]{'active'}},
            'active' => ${\$VAR1->[0]{'active'}},
            'name' => 'Bill Johnson'
          },
          {
            'name' => 'Frank Johnson',
            'active' => ${\$VAR1->[0]{'happy'}},
            'happy' => ${\$VAR1->[0]{'happy'}}
          },
          {
            'active' => ${\$VAR1->[0]{'happy'}},
            'name' => 'George Johnson',
            'happy' => ${\$VAR1->[0]{'active'}}
          }
        ];
[download]

YAML::Syck

$VAR1 = [
          {
            'active' => 'true',
            'happy' => 'false',
            'name' => 'Bob Johnson'
          },
          {
            'name' => 'Bill Johnson',
            'happy' => 'true',
            'active' => 'true'
          },
          {
            'active' => 'false',
            'happy' => 'false',
            'name' => 'Frank Johnson'
          },
          {
            'name' => 'George Johnson',
            'happy' => 'true',
            'active' => 'false'
          }
        ];
[download]

The values from YAML::Syck are fine with me, somewhat. I was hoping for 1/0, but no big deal really, since true/false will evaluate fine. However, the results from YAML::XS are not exactly what I was expecting. I was hoping for each key to have its own value, not for keys to point to the values of other keys, which is what it seems that this is doing. Is there some way with YAML::XS to have boolean values? It seems to me that if a key has the same value as another key, then that key's value just becomes a reference for the other key's value.

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