Extend and backport SubNode peephole - #254
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Require resolved integer mode in chapter 25 so zero subtraction preserves floating-point signed zero. Keep nonnumeric operands in the graph for subtraction diagnostics. Add signed-zero coverage from chapter 12 and null-subtraction diagnostics from chapter 22. Confirmed the regressions fail on the original PR. Full Make suites pass in chapters 4-25 (5462 tests), including fresh chapter 25 sys.o compilation.
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Sep 25, 2026
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Includes corrections for null-0 and flt-zero sign flippage
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(x - 0) == xand(0 - x) == -x.