Missing escaping for uppercase "No"

[Zinggi]

Issue description

Similar to #184, I've found another issue with escaping:

iex> Ymlr.document!(%{foo: "No"})
"---\nfoo: No\n"

correct would be:

irb> YAML.dump({"foo"=> "No"})
=> "---\nfoo: 'No'\n"

It's already correct for lowercase 'no':

iex> Ymlr.document!(%{foo: "no"})
"---\nfoo: 'no'\n"

Link to documentation

https://yaml.org/type/bool.html

[Zinggi]

However, it seems like yaml 1.2 dropped this insane handling of boolean values and only accepts true|false.
So which version of the spec does this library actually target?

At the very least, it's an inconsistency, as it handles lowercase no like yaml 1.1, but uppercase like yaml 1.2.

[Zinggi]

As for me, I think I will switch to using https://github.com/processone/fast_yaml for my project, as I need 1-to-1 compatibility with the ruby yaml library. And since fast_yaml uses the same underlying libyaml, it should provide max compatibility between the two.

[Zinggi]

fast_yaml seems to handle this case correctly, but unfortunately I get the "wrong" quotes. Not great either for my usecase...

iex> :fast_yaml.encode(%{foo: "No"}) |> IO.iodata_to_binary
"foo: \"No\""

[mruoss]

Hi @Zinggi

Thanks for raising this.

So which version of the spec does this library actually target?

The quoted version is valid in both versions. So let's aim for that.