Forcing real treeification: 20 keys with hashCode()==1, loadFactor=1000f (size-resize disabled)
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All keys hash to the same bucket (see CollidingKey javadoc for why a resize can't separate them).

after inserting key #1  : table.length=16   bucket[1] chain=1   kind=Node
after inserting key #9  : table.length=32   bucket[1] chain=9   kind=Node
after inserting key #10 : table.length=64   bucket[1] chain=10  kind=Node
after inserting key #11 : table.length=64   bucket[1] chain=11  kind=TreeNode

Final state: table.length=64, bucket[1] kind=TreeNode, first became a tree at insert #11