284e5d79cd
Fix two bugs in DocNode's comparison operators and add a new Document::copyNode() method: 1. operator== was implemented via operator<, which hits llvm_unreachable for Array/Map nodes. Implement operator== directly with recursive value comparison for all node types. 2. operator< compared KindAndDoc pointers, causing cross-document nodes of the same type and value to silently produce wrong results. Compare by kind then by value instead. 3. Add Document::copyNode() for deep copying nodes between Documents with independent memory ownership.
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