add support for value_ref #379

Job	Run time
flake8_tests	16s
python2_tests (debian10, extrasettings)	1m 33s
python2_tests (debian10, extraserver)	1m 25s
python3_tests (debian12, extrasettings)	3s
python2_tests (debian10, basicserver)	1m 23s
python3_tests (debian12, extraserver)	1m 8s
python2_tests (debian10, basicsettings)	1m 33s
python3_tests (debian12, basicserver)	1m 8s
python2_tests (debian10, basic)	1m 33s
python3_tests (debian12, basicsettings)	1m 9s
python3_tests (debian12, basic)	1m 9s
python3_tests (debian11, extrasettings)	1m 26s
python3_tests (debian11, extraserver)	1m 22s
python3_tests (debian11, basicserver)	1m 21s
python3_tests (debian11, basicsettings)	1m 27s
python3_tests (debian11, basic)	1m 29s
python3_tests (debian10, extrasettings)	1m 23s
python3_tests (debian10, extraserver)	1m 26s
python3_tests (debian10, basicserver)	1m 23s
python3_tests (debian10, basicsettings)	1m 22s
python3_tests (debian10, basic)	1m 27s
python3_tests (ubuntu22.04, extrasettings)	1s
python3_tests (ubuntu22.04, extraserver)	1s
python3_tests (ubuntu22.04, basicserver)	1s
python3_tests (ubuntu22.04, basicsettings)	1s
python3_tests (ubuntu22.04, basic)	1s
python3_tests (ubuntu24.04, extrasettings)	1s
python3_tests (ubuntu24.04, extraserver)	1s
python3_tests (ubuntu24.04, basicserver)	1s
python3_tests (ubuntu24.04, basicsettings)	1s
python3_tests (ubuntu24.04, basic)	1s
	26m 36s

Provide feedback