Improve error model, callbacks #794

Job	Run time
samples (Debug, ubuntu-20.04)	2m 23s
samples (Release, ubuntu-20.04)	3m 8s
samples (Debug, windows-2019)	2m 39s
samples (Release, windows-2019)	7m 36s
samples (Debug, macos-latest)	2m 5s
samples (Release, macos-latest)	2m 9s
	20m 0s

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