PyGAD 3.8.1

PyGAD 3.8.1

Release Date: October 11, 2026.

1. Random and adaptive mutation clip generated values to NumPy integer type limits before casting, fixing overflow errors and wraparound with types such as numpy.uint8 and numpy.int8. The same rule covers additive and replacement mutation, None gene-space entries, constraint candidates, and duplicate repair. Clipping applies only to explicitly requested NumPy integer types. See issue #379 and Conversion and Rounding Rules.
2. Python int conversion of candidate arrays and population columns uses explicit signed 64-bit storage across NumPy versions and platforms, fixing large-integer conversion and initialization failures on Windows with NumPy 1.x. Integer range sampling and bounded operators use the same storage limits. Parent selection and crossover share array allocation, preserving large integers throughout the lifecycle. Per-gene Python int elements keep their scalar type, and explicitly requested NumPy types keep their widths. Supplied Python int population values must fit in signed 64-bit storage; use gene_type=object for larger supplied integers. See Conversion and Rounding Rules.
3. Regression tests cover integer mutation limits, exact large-integer storage, initialization, constraints, duplicate repair, parent selection, crossover, and NSGA-III population growth. Windows CI checks both NumPy 1.24.4 and the latest NumPy release without version-specific implementation branches. The 16 pre-existing Windows failures with NumPy 1.24.4 are fixed, and no higher NumPy minimum is required. The pygad.helper and pygad.utils submodule versions are 1.4.6 and 1.5.8.