decrement refcount before destruction #96

	#
	# Test that the package can be built using modern PEP 517 build package method: `python -m build --wheel`
	# https://pypa-build.readthedocs.io/en/stable/
	#

	name: PEP 517

	on:
	pull_request:
	push:
	branches:
	- master

	defaults:
	run:
	shell: bash

	jobs:
	build:
	strategy:
	fail-fast: false
	matrix:
	os: [ ubuntu-20.04, ubuntu-22.04, windows-latest, macos-latest ]
	python: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
	runs-on: ${{ matrix.os }}
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true
	- name: Setup Python ${{ matrix.python }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python }}
	- name: Install build dependencies
	run: \|
	python -m pip install build
	- name: Build eigency
	run: \|
	python -m build --wheel

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