Re: YAML 2.0: drop arbitrary nodes to be used as keys

I helps if you have an immutable data structure as a key - e.g., a complex
number, a point, etc.

Many YAML files can't be easily converted to JSON - anything with a tag,
for starters...

On Wed, Mar 2, 2016 at 12:23 PM, Andrey Somov <[email protected]>
wrote:

> Hi all,
> even though it looks like a powerful feature, it gives nothing.
>
> This should be removed:
> Note that YAML allows arbitrary nodes
> <http://www.yaml.org/spec/1.2/spec.html#node//> to be used as keys
> <http://www.yaml.org/spec/1.2/spec.html#key//>. In particular, a key
> <http://www.yaml.org/spec/1.2/spec.html#key//> may be a sequence
> <http://www.yaml.org/spec/1.2/spec.html#sequence//> or a mapping
> <http://www.yaml.org/spec/1.2/spec.html#mapping//>. Thus, without the
> above restrictions, practical one-pass parsing
> <http://www.yaml.org/spec/1.2/spec.html#parse//> would have been
> impossible to implement.
>
> The reason is not that it makes it impossible to convert YAML to JSON.
> The reason is that it must never be used. YAML should not advocate
> collections (often mutable data structures) as keys.
> Of course, the related restrictions, like "1024 rule" or  "key is
> restricted to a single line", are also gone.
> The key must be a scalar. Point. Whatever it is.
>
> Cheers,
> Andrey
>
>
>
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