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Backwards compatibility for Node <= 9 #271

Job	Run time
Deno tests and build npm files	20s
Smoke tests (ESM) (14.x)	10s
Smoke tests (CommonJS) (7.x)	8s
Smoke tests (ESM) (15.x)	12s
Smoke tests (CommonJS) (8.x)	9s
Smoke tests (ESM) (16.x)	11s
Smoke tests (CommonJS) (9.x)	9s
Smoke tests (ESM) (17.x)	8s
Smoke tests (CommonJS) (10.x)	9s
Smoke tests (ESM) (18.x)	7s
Smoke tests (CommonJS) (11.x)	11s
Smoke tests (ESM) (19.x)	9s
Smoke tests (CommonJS) (12.x)	10s
Smoke tests (CommonJS) (13.x)	12s
Smoke tests (CommonJS) (14.x)	13s
Smoke tests (CommonJS) (15.x)	11s
Smoke tests (CommonJS) (16.x)	8s
Smoke tests (CommonJS) (17.x)	12s
Smoke tests (CommonJS) (18.x)	8s
Smoke tests (CommonJS) (19.x)	10s
	3m 27s

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