Improve error model, callbacks #793

Job	Run time
samples (Debug, ubuntu-20.04)	2m 20s
samples (Release, ubuntu-20.04)	3m 9s
samples (Debug, windows-2019)	3m 48s
samples (Release, windows-2019)	7m 40s
samples (Debug, macos-latest)	1m 28s
samples (Release, macos-latest)	2m 12s
	20m 37s

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