Version 0.3.8
=============

**Release Date:** April 26, 2026

**Status:** Stable release

Overview
--------

EPyR Tools v0.3.8 focuses on documentation quality and a refactor of the
fitting module. Several CLI output bugs that prevented ``pytest`` from
capturing user messages are also fixed.

Highlights
----------

Fitting module refactor
~~~~~~~~~~~~~~~~~~~~~~~

- ``epyr.lineshapes.fitting`` split into focused private helpers for the
  fit-function factory, initial-parameter estimation per derivative order,
  and bound construction.
- Public API unchanged: ``fit_epr_signal``, ``fit_multiple_shapes``,
  ``FitResult`` keep their previous signatures and behaviour.
- Improved support for derivative + phase + affine-baseline combinations.

Documentation quality
~~~~~~~~~~~~~~~~~~~~~

- Docstrings audited and tightened across the public surface.
- Mathematical conventions and physical units stated explicitly where
  they were previously implicit.
- LaTeX equations rendered in docstrings for the lineshape family.

CLI output fixes
~~~~~~~~~~~~~~~~

- CLI user messages now go through ``print()`` instead of
  ``logger.info()`` so that ``capsys`` captures them in tests. Internal
  diagnostics still use the logger.
- ``np.zeros_like`` and similar calls now pass ``dtype=float`` explicitly
  when inputs may be integer arrays, avoiding NumPy 2.x compatibility
  warnings.

No backwards-incompatible changes.