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The prefix always reported itself as existing, with one child, so a walk descended through it into a source that doesn't exist. The prefix now exists only when the source's root does.
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Fix PrefixZipper over a source rooted at a missing path
The prefix always reported itself as existing, with one child, so a walk
descended through it into a source that doesn't exist. The prefix now
exists only when the source's root does.
Fix PrefixZipper fork rooted at the focus