Comment 3 for bug 1412498

I feel like there's another Heat bug with this concern already but can't seem to find it.

http://pyyaml.org/ticket/128

So PyYAML is being silent where it should not. The spec is quite clear on this:

http://www.yaml.org/spec/1.2/spec.html#id2763754

Anyway, personally I think there are two ways to handle this that haven't been explored fully:

1) Fix PyYAML/libyaml - Might not be as hard as the age of the bug suggests.
2) Introduce a list-based system and have a 'name' field that can be duplicate but will be detected by Heat.