As agreed offline, the etc directory has long not been in use (notably duplicating data now in constants module) and can be removed to tidy the codebase and to prevent packaging getting confused and raising warnings about it, e.g. from a CI job:
[90](https://github.com/NCAS-CMS/cf-python/actions/runs/34459805523/job/102814670829?pr=967#step:12:591)
!!
check.warn(importable)
/private/var/folders/20/jp1_0n3n7kndh6rnbqb5344m0000gn/T/build-env-27lv9eqx/lib/python3.14/site-packages/setuptools/command/build_py.py:215: _Warning: Package 'cf.etc.coordinate_reference' is absent from the `packages` configuration.
!!
********************************************************************************
############################
# Package would be ignored #
############################
Python recognizes 'cf.etc.coordinate_reference' as an importable package[^1],
but it is absent from setuptools' `packages` configuration.
As agreed offline, the
etcdirectory has long not been in use (notably duplicating data now inconstantsmodule) and can be removed to tidy the codebase and to prevent packaging getting confused and raising warnings about it, e.g. from a CI job: