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- A list copy holds each new copy as a root while the list is charged for it, so a collection at that point no longer frees the copy. Before, `x.setChildren(<c/> + <d/>)` near the heap limit could leave one child twice or end with an internal error. - An assignment to a path such as `x.a.b = v` or `x.a.b[0] = v` removes the elements it added for the path when a later step stops at a limit or throws. - Comparing XML values counts the attribute tables and the work stack against the heap limit.