literal: round-half-even tie for normal-range float/complex repr#8243
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to_string's normal-magnitude branch and complex::component_to_string returned Rust's shortest formatting directly, which can pick the odd-digit neighbour of a rounding tie where repr() picks the even one (e.g. bits 0x42e26687db6b9b04 formats as 161852602146008.13 vs repr's ...08.12). Route both through prefer_cpython_tie_repr, generalized to fixed-notation strings. Add a normal-range tie unit test. Assisted-by: Claude
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youknowone
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Jul 9, 2026
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| #[test] | ||
| fn repr_normal_range_uses_cpython_tie_digit() { |
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float::to_string's normal-magnitude branch andcomplex::component_to_stringreturned Rust's shortest formatting directly. Rust's formatter can land on the odd-digit neighbour of a rounding tie whererepr()'s round-half-to-even picks the even one, e.g. bits0x42e26687db6b9b04format as161852602146008.13but CPythonreprgives161852602146008.12(both round-trip).The scientific branch of
float::to_stringalready ran throughprefer_cpython_tie_repr; this extends that helper to fixed-notation strings and applies it to the normal-magnitude float branch and to both complex branches.Verified against CPython 3.14 over a differential battery (20k floats, 280k complex pairs incl. subnormals / powers of ten / ties): 0 divergences after the fix. Added a normal-range tie unit test.
— assisted by Claude