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This reverts commit 2f3a24d9.
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… useful if several structures hold the members
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…s, so they probably have bugs.
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… detructor to only conditionally free data within the nodes.
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…s different from the behaviour of tsearch which is the POSIX equivalent of this function, but in various situations it is much more handy.
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…ent. Some small fixes
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…ight and parent reference to variables of itself.