add INT8 to isNumber method #1578

Job	Run time
code-style-and-static-analysis	1m 28s
Test Suite (7.4, sqlite, 5-min)	58s
Test Suite (7.4, sqlite, 5-max)	1m 25s
Test Suite (7.4, mysql, 5-min)	1m 14s
Test Suite (7.4, mysql, 5-max)	1m 46s
Test Suite (7.4, pgsql, 5-min)	1m 16s
Test Suite (7.4, pgsql, 5-max)	1m 48s
Test Suite (7.4, agnostic, 5-min)	43s
Test Suite (7.4, agnostic, 5-max)	1m 2s
Test Suite (8.2, sqlite, 5-min)	58s
Test Suite (8.2, sqlite, 5-max)	51s
Test Suite (8.2, sqlite, 6-min)	47s
Test Suite (8.2, sqlite, 6-max)	50s
Test Suite (8.2, sqlite, 7-min)	1m 10s
Test Suite (8.2, sqlite, 7-max)	1m 14s
Test Suite (8.2, mysql, 5-min)	31s
Test Suite (8.2, mysql, 5-max)	39s
Test Suite (8.2, mysql, 6-min)	32s
Test Suite (8.2, mysql, 6-max)	33s
Test Suite (8.2, mysql, 7-min)	32s
Test Suite (8.2, mysql, 7-max)	30s
Test Suite (8.2, pgsql, 5-min)	1m 27s
Test Suite (8.2, pgsql, 5-max)	1m 7s
Test Suite (8.2, pgsql, 6-min)	1m 23s
Test Suite (8.2, pgsql, 6-max)	1m 10s
Test Suite (8.2, pgsql, 7-min)	1m 12s
Test Suite (8.2, pgsql, 7-max)	1m 15s
Test Suite (8.2, agnostic, 5-min)	23s
Test Suite (8.2, agnostic, 5-max)	32s
Test Suite (8.2, agnostic, 6-min)	2m 35s
Test Suite (8.2, agnostic, 6-max)	24s
Test Suite (8.2, agnostic, 7-min)	25s
Test Suite (8.2, agnostic, 7-max)	28s
	33m 8s

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