why are opCmp and opEquals not pure.

[Stefan Koch via Digitalmars-d]

Hi,
is there any reason why opCmp and opEquals are not pure ?
I would argue it is very counter-intuitive to mutate any state 
when comparing objects.

opCmp and opEquals not being annotated pure is a major problem 
for me in writing ctfe-able code.

since any call to Object.opEquals need to be warped in another 
function to be able to cast the Function pure.