>
>> The `is` prefix doesn’t provide any functionality that would otherwise
>> be unavailable. It doesn’t add any value, yet causes incompatibility,
>> author confusion, and it increases implementation complexity.
>
> I don't see any evidence that it adds no value. Support for existing
> implementations is value.
It adds no value because it doesn’t enable any new functionality.
I agree support for existing implementations would have some value, but given that existing implementations disagree on the properties for which they support `is` that is not going to happen anyway. It’s impossible to be compatible with all those different implementations at the same time.
Received on Mon Jun 06 2016 - 10:41:02 CDT
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