A small remark about #asAntiDelta.

I think its better to rename it to one of:
#asReverseDelta
#reversed

then code can look more nicely:

self reversed apply

or even:

self reverseApply  (which will do exactly 'self reversed apply')

I'm just don't like word 'Anti' in this context. For me, a words
'reverse changes' have more closer meaning to 'undoing changes' than
'anti changes'.


-- 
Best regards,
Igor Stasenko AKA sig.