v0.43.1

Release 0.43.1 (2026-08-02)

Bug fixes

• Improve numerical stability and domain coverage of gamma_approx and ln_gamma_approx (#105) (Thanks to @jzeuzs)
  • ln_gamma_approx now applies Euler's reflection formula for z < 0.5, which previously only gamma_approx did.
  • Poles are handled explicitly: gamma_approx returns NaN at negative integers and ln_gamma_approx returns +inf at non-positive integers.
  • The positive-integer fast path accumulates in f64 instead of the integer factorial helper, and saturates to +inf above z = 171.
  • Adds 171 lines of tests covering poles, reflection, integer arguments and large-magnitude inputs.
• Make ln_gamma exact at small integers and gamma(-0.0) negative infinity (#113)
  • Integer arguments up to 23 route through the exact factorial path, so ln_gamma_approx(1.0) and ln_gamma_approx(2.0) return exactly 0 instead of about -1e-11. This matters for callers that subtract two log-gammas of equal argument.
  • gamma_approx(-0.0) returns -inf while gamma_approx(0.0) returns +inf, matching C99 tgamma and SciPy.

JOSS review (#10366) cycle

Metadata

• Add Russell R P Senthamarai to CITATION.cff and the manuscript author list. The manuscript and CITATION.cff now list the same eight named authors in the same order with matching ORCIDs.
• Use a single SPDX identifier for the CITATION.cff license field. MIT OR Apache-2.0 is an SPDX expression, which the Citation File Format 1.2.0 schema does not accept. Zenodo validates the file with cffconvert during GitHub release archiving, so the v0.42.0 and v0.43.0 archives failed and never received a DOI. The array form is valid per the CFF spec but Zenodo has rejected it since the InvenioRDM migration (zenodo/zenodo#2515). The crate stays dual-licensed under MIT or Apache-2.0 through Cargo.toml and the two LICENSE-* files.

Documentation

• Apply editorial wording fixes to the manuscript (#114) (Thanks to @jbytecode)