add INT8 to isNumber method #1579

Job	Run time
code-style-and-static-analysis	1m 19s
Test Suite (7.4, sqlite, 5-min)	47s
Test Suite (7.4, sqlite, 5-max)	47s
Test Suite (7.4, mysql, 5-min)	1m 16s
Test Suite (7.4, mysql, 5-max)	1m 26s
Test Suite (7.4, pgsql, 5-min)	1m 1s
Test Suite (7.4, pgsql, 5-max)	1m 6s
Test Suite (7.4, agnostic, 5-min)	48s
Test Suite (7.4, agnostic, 5-max)	37s
Test Suite (8.2, sqlite, 5-min)	56s
Test Suite (8.2, sqlite, 5-max)	43s
Test Suite (8.2, sqlite, 6-min)	40s
Test Suite (8.2, sqlite, 6-max)	59s
Test Suite (8.2, sqlite, 7-min)	1m 1s
Test Suite (8.2, sqlite, 7-max)	41s
Test Suite (8.2, mysql, 5-min)	1m 8s
Test Suite (8.2, mysql, 5-max)	1m 2s
Test Suite (8.2, mysql, 6-min)	1m 5s
Test Suite (8.2, mysql, 6-max)	35s
Test Suite (8.2, mysql, 7-min)	39s
Test Suite (8.2, mysql, 7-max)	34s
Test Suite (8.2, pgsql, 5-min)	1m 9s
Test Suite (8.2, pgsql, 5-max)	1m 2s
Test Suite (8.2, pgsql, 6-min)	1m 0s
Test Suite (8.2, pgsql, 6-max)	1m 2s
Test Suite (8.2, pgsql, 7-min)	1m 15s
Test Suite (8.2, pgsql, 7-max)	1m 13s
Test Suite (8.2, agnostic, 5-min)	23s
Test Suite (8.2, agnostic, 5-max)	36s
Test Suite (8.2, agnostic, 6-min)	30s
Test Suite (8.2, agnostic, 6-max)	38s
Test Suite (8.2, agnostic, 7-min)	46s
Test Suite (8.2, agnostic, 7-max)	32s
	29m 16s

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