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A two-level numeric tower: exact decimals (rust_decimal) by default, inexact f64 by Scheme's contagion rule. Measured against f64, bigdecimal and num-rational, and against ADR 009's exact f64 accumulator. Registered on the doc site. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze