M8a: $formatNumber + $formatBase half-even fix#26

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feature/m8a-formatnumber

Jun 25, 2026

Commits on Jun 25, 2026

fix(M8a): $formatBase rounds half-even (shared H.round_half_even), not floor

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feat(M8a): $formatNumber — XPath decimal-format picture (faithful jsonata port)

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fix(M8a): faithful half-even round (no digit loss) + oracle error messages

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