What's up with the assert enhancements proposed years ago?

[Nick Sabalausky via Digitalmars-d]

On 09/23/2016 11:47 PM, Nick Sabalausky wrote:
> On 09/23/2016 07:57 PM, Jonathan M Davis via Digitalmars-d wrote:
>> On Friday, September 23, 2016 16:57:49 Nick Sabalausky via Digitalmars-d
>> wrote:
>>>
>>> So...umm...yea...whatever happened to that beefed-up "assert" feature?
>>
>> [...]
>>
>
> Ugh, so, "It was rejected for being library instead of assert, then it
> was rejected for being assert instead of library".
>
> /facepalm
>
> Guess I'll just have to try getting used to awful Java-isms like
> x.notEqual(y) :(

And then that leads too, to the question of whether such third-party 
asserts are a good idea for the doc unittests I like so much... :/