[ot][spam][crazy] log: append-only random-access data

[Undiscussed Horrific Abuse, One Victim of Many]

here's what i have now

its intent is to test [the correctness] of iterating leaves when the
structure is just appending, without using a tree.

there is presently a logic error demonstrated when it is run. there
may be many, many logic errors in it.

i called the confusing class name "Chunk". seems ok.
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