Stepping without using class vtables #778

Job	Run time
tests (ubuntu-latest, tests)	27s
build (ubuntu-latest, noradio)	1m 53s
tests (macos-latest, tests)	26s
build (ubuntu-latest, wifi)	2m 13s
tests (windows-latest, tests_nosan)	1m 23s
build (ubuntu-latest, bt)	2m 1s
build (macos-latest, noradio)	1m 38s
build (macos-latest, wifi)	1m 42s
build (macos-latest, bt)	1m 35s
build (windows-latest, noradio)	5m 17s
build (windows-latest, wifi)	6m 2s
build (windows-latest, bt)	5m 24s
	30m 1s

Provide feedback