tests

change policy on the default symbol for an implicit chromosome #1416

Job	Run time
tests-Windows-CLI (mingw64, x86_64, 3.8)	17m 32s
canceller	4s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	17m 22s
tests-windows-latest-pacman (mingw64, x86_64)	1m 48s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 44s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	5m 57s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	6m 22s
tests-Windows-GUI (mingw64, x86_64)	13m 14s
tests-Unix-CLI (macos-13, 3.9)	9m 29s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 5s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	13m 41s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	6m 19s
tests-Unix-CLI (macos-15, 3.9)	4m 43s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 37s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 53s
tests-Unix-GUI (macos-13, 5.15.2)	6m 29s
tests-Unix-GUI (macos-15, 6.7.2)	4m 18s
	2h 8m 37s

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