In debug logging, print 'fixed' values as floats #1149

Job	Run time
cargo-deny	24s
clippy-check	1m 33s
format	37s
Documentation on Github Pages	52s
coverage-main	1m 10s
check-minimal	1m 1s
coverage-tests	1m 16s
msrv	2m 30s
coverage-tests (server_system)	1m 25s
coverage-tests (client_system)	1m 32s
coverage-tests (client_system, server_system)	1m 13s
	13m 33s

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