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Defer simplifying a trivial node's first child until its child count is known. Multi-child operators otherwise simplify their first subtree twice, causing exponential work on left-deep addition and multiplication trees. Add traversal-count regression tests for both operators and preserve coverage of results, input expressions, single-child wrappers, and context.
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Defer simplifying a trivial node's first child until its child count is known. Multi-child operators otherwise simplify their first subtree twice, causing exponential work on left-deep addition and multiplication trees.
Add traversal-count regression tests for both operators and preserve coverage of results, input expressions, single-child wrappers, and context.