serialize event count in store function call #1253

Job	Run time
lint	1m 30s
unit_tests (18)	2m 6s
unit_tests (20)	2m 0s
lint_markdown_files / lint	58s
integration_tests / test	6s
unit_tests (24)	1m 45s
unit_tests (22)	1m 59s
fullstack_production_suite / test	6s
Coveralls coverage	3s
	10m 33s

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