YAML Implementations Borked

YAML.out

# Using the PurePerl implementation written by the author of the YAML Spec
brad@beta $ perl -MYAML -MDDP -E'my $y = "country: NO"; my $x = YAML::Load($y); p($x)'
{
    country   "NO"
}
brad@beta $ perl -MYAML -MDDP -E'my $y = "date: 0000-00-00"; my $x = YAML::Load($y); p($x)'
{
    date   "0000-00-00"
}


# Using libyaml C library
brad@beta $ perl -MYAML::XS -MDDP -E'my $y = "country: NO"; my $x = YAML::XS::Load($y); p($x)'
{
    country   "NO"
}
brad@beta $ perl -MYAML::XS -MDDP -E'my $y = "date: 0000-00-00"; my $x = YAML::XS::Load($y); p($x)'
{
    date   "0000-00-00"
}


# What the actual fuck is this?
brad@beta $ python3 -c 'import yaml ; y="country: NO" ; x=yaml.safe_load(y) ; print(yaml.dump(x))'
country: false

brad@beta $ python3 -c 'import yaml ; y="date: 0000-00-00" ; x=yaml.safe_load(y) ; print(yaml.dump(x))'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import yaml ; y="date: 0000-00-00" ; x=yaml.safe_load(y) ; print(yaml.dump(x))
                                              ~~~~~~~~~~~~~~^^^
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/__init__.py", line 125, in safe_load
    return load(stream, SafeLoader)
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/__init__.py", line 81, in load
    return loader.get_single_data()
           ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 51, in get_single_data
    return self.construct_document(node)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 60, in construct_document
    for dummy in generator:
                 ^^^^^^^^^
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 413, in construct_yaml_map
    value = self.construct_mapping(node)
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 218, in construct_mapping
    return super().construct_mapping(node, deep=deep)
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 143, in construct_mapping
    value = self.construct_object(value_node, deep=deep)
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 100, in construct_object
    data = constructor(self, node)
  File "/Users/brad/tmp/yaml/lib/python3.13/site-packages/yaml/constructor.py", line 330, in construct_yaml_timestamp
    return datetime.date(year, month, day)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
ValueError: year 0 is out of range