dmd 2.065.0

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On Monday, 24 February 2014 at 21:00:53 UTC, Steven Schveighoffer 
wrote:
> I think the change should go (if it was intentional).
>
> IIRC, opCmp was required in D1 and older versions of D2, 
> because hash collisions were stored in a tree instead of a LL.
>
> The documentation should be updated too.
>
> -Steve

Why *was* there a change to enforce that AA keys have opCmp? It 
doesn't seem to me like any responses SiegeLord got were 
satisfactory, i.e., why was this change made, and why was it not 
in the changelog?