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Chained PtgParen/PtgUminus (or operator) tokens built a ~16K-deep Expr whose printing or drop overflowed the stack; nesting past the formula parser's MAX_DEPTH (256) is now reported as unsupported. BoundSheet records pointing into one huge substream each got their own 40M-record allowance; the allowance is now shared by the whole Workbook stream, and two sheets at the same offset are refused. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>