[Remops] Why is 4096 bit Mixmaster consider 'experimental'?

[Cypher]

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I've seen talk of a mixmaster that supports 4096 bit keys but that
discussion is always followed up with a warning that it's experimental
and not for public consumption yet.

Can anyone fill me in on /why/ it's considered experimental? What
needs to be done in order to get it to a production quality?  Is there
a link to the code somewhere?

Thanks,
Cypher

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