From: Craig Gallek <[email protected]>
Date: Thu, 21 Sep 2017 18:43:29 -0400

> From: Craig Gallek <[email protected]>
> 
> Before the delete operator was added, this datastructure maintained
> an invariant that intermediate nodes were only present when necessary
> to build the tree.  This patch updates the delete operation to reinstate
> that invariant by removing unnecessary intermediate nodes after a node is
> removed and thus keeping the tree structure at a minimal size.
> 
> Suggested-by: Daniel Mack <[email protected]>
> Signed-off-by: Craig Gallek <[email protected]>

Applied, thank you.

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