Andreas Ericsson <> writes:

> You seem to believe that the in-memory representation of trees have to
> be the same as the on-disk one. That's simply not true. Git cheats
> outrageously with internal formats for pretty much everything in order
> to squeeze out more performance.

While the last statement applies to other parts of the system, it is
not true for the in-core index design.  We always had a flat index,
and it is not cheating at all.  The original "tree" was also a flat
representation of everything under the sun, and hierarchical tree
objects came much later.
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