* Add round-half-even hex float parser to common float_ops
Add float_ops::from_hex returning Result<f64, HexFloatError>, which parses
the coefficient and exponent, rounds round-half-even over the full exponent
range, and detects overflow. Route float.fromhex through it: raise
OverflowError for values too large to represent and ValueError for invalid
input. Remove the expectedFailure on test_from_hex.
Assisted-by: Claude
* Address review: Option-returning byte helpers, const fns, drop test_ prefix
Assisted-by: Claude
* Whitelist fdigits and inity in cspell
Assisted-by: Claude
* Home is_py_ascii_whitespace in rustpython-wtf8; share with common and sre_engine
Assisted-by: Claude
* Use shared wtf8 is_py_ascii_whitespace in bytes_inner
Remove the private copy of is_py_ascii_whitespace in bytes_inner.rs and
import the shared rustpython_common::wtf8::is_py_ascii_whitespace.
Assisted-by: Claude
* Round float at the decimal level to match CPython's _Py_dg_dtoa
CPython's `float.__round__` (Objects/floatobject.c) routes through
`_Py_dg_dtoa` and rounds at the decimal level. The previous
`round_float_digits` multiplied by 10**ndigits and rounded at the
IEEE 754 binary level, which diverges for values that aren't exactly
representable. For example, 2.675 stores as 2.67499...; dtoa correctly
rounds it down to 2.67, but `(2.675 * 100.0).round() / 100.0` lands on
2.68 because the multiplication produces a phantom 267.5 tie that
round-half-to-even snaps up.
Rust's `{:.*}` float formatting uses dtoa-style algorithms (Grisu3 +
Dragon4 fallback) and matches CPython's `_Py_dg_dtoa` byte-for-byte.
Replace the multiply-then-round step with `format!` + `parse` for
ndigits >= 0. The ndigits < 0 path is unchanged because dividing
typical inputs by 10**|ndigits| produces genuine ties rather than
synthesizing them.
Verified byte-identical with CPython 3.14.4 over a 108-case random
fuzz plus targeted half-tie probes. Unmasks
`test_float.RoundTestCase.test_matches_float_format` and
`test_previous_round_bugs`.
* Use #[expect] with reason for float_cmp suppression
Co-authored-by: ShaharNaveh <50263213+ShaharNaveh@users.noreply.github.com>
---------
Co-authored-by: ShaharNaveh <50263213+ShaharNaveh@users.noreply.github.com>
Jeong, YunWon