RBT(fix): update size when removing final node; fixes #43 #45
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The
RedBlackTree.removefunction usually updates the size of the tree, but it has an early exit for the case when a tree only has one node. Previously, the size was not getting updated in this case for mutable trees, so the tree would end up in an invalid state when is should be empty. This commit ensures that the size is correctly updated when removing the final node.