Try to reproduce serialize issues #652

Job	Run time
cs-stan / Coding Standard & Static Analysis	27s
testsuite / testsuite-linux (8.2, pgsql, highest, false)	36s
testsuite / testsuite-linux (8.2, mysql, highest, false)	54s
testsuite / testsuite-linux (8.3, sqlite, highest, false)	28s
testsuite / testsuite-linux (8.4, mysql, highest, false)	45s
testsuite / testsuite-linux (8.2, sqlite, lowest, false)	30s
testsuite / testsuite-linux (8.5, sqlite, highest, false)	45s
	4m 25s

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