barflow v0.2.3

Changed

• Lowered the minimum Python to 3.10 (was 3.13). The C core already
  version-gated its only 3.12+ fast-path API (_PyLong_IsCompact /
  _PyLong_CompactValue) behind PY_VERSION_HEX with a public-API
  fallback, and the free-threaded PyUnstable_Module_SetGIL call is
  guarded by Py_GIL_DISABLED, so nothing blocked older interpreters.
  requires-python, the PyPI classifiers, the README, and the
  cibuildwheel matrix now cover CPython 3.10–3.14. Verified by building
  and smoke-testing the extension on 3.10, 3.11, and 3.12.