Re: Next YAML: drop equality definition

Hi Osamu, excellent post with lots of links and all! Thank you. One
question below.

On 3/4/16, Osamu TAKEUCHI <[email protected]> wrote:
> There were long arguments how we should treat equality of nodes in YAML.
>
> https://sourceforge.net/p/yaml/mailman/search/?q=%22%5BYAML-core%5D+equality%22&mail_list=all&sort=posted_date%20desc
>
> Currently, equality of nodes is used in two purposes. One is to
> reject a mapping with duplicate keys in the YAML 1.2 spec.
> The spec says a mapping with duplicate keys should be rejected
> by a YAML parser. The other is for allowing a library to represent
> some equal scalar nodes by an single identical node to save memory
> consumption.
>
>   https://sourceforge.net/p/yaml/mailman/message/23572250/
>
> It sounds straightforward at first but not in the reality.
> The equality of nodes involves issues when anchor/alias and
> implicit tag resolution are involved.
>
> To solve the problems, Oren proposed the following.
>
>   https://sourceforge.net/p/yaml/mailman/message/24061658/
>
>> Do not specify YAML equality rules. Eliminate most of the discussion
>> of equality, canonical formats etc. and replace it by a stating that
>> implementations "may" reject mappings that have "equal" keys,
>> according to their own *implementation-specific* definition of equality.
>> Constrain this
>> to say that nodes with equal tags and equal content are always
>> equal and hence "must" be rejected as duplicates.

Could both of these, the "may reject" option, and the "constrain ...
and must reject" option, be part of the schema, or specified by
command line option/ side-channel specification of at the appropriate
layer?

"Implementation dependent" doesn't feel like enough control.

Thanks again,
Zenaan

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