Const: Add is_int property. #524

Job	Run time
macos / Test macOS	26s
windows / Test Windows	40s
ci / Build	3m 27s
ci / Typecheck	1m 15s
ci / Lint	58s
ci / Test (0)	9m 17s
ci / Test (1)	9m 24s
ci / Test (2)	4m 25s
ci / Test (3)	7m 56s
ci / Test (4)	3m 57s
ci / Test (5)	3m 18s
ci / Test (6)	5m 15s
ci / Test (7)	7m 20s
ci / Test (8)	6m 0s
ci / Test (9)	6m 24s
ci / Publish Unit Tests Results	1s
	1h 10m 3s

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