Pyshp 3.0.0 alpha attype of the clones #15

Job	Run time
build_wheel_and_sdist	17s
run_speed_tests (3.9, ubuntu-24.04)	19s
run_speed_tests (3.13, ubuntu-24.04)	18s
run_speed_tests (3.9, windows-latest)	38s
run_speed_tests (3.13, windows-latest)	36s
	2m 8s

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