doxbee-async and doxbee-promise: add side-effects #761

Job	Run time
Test Browser on macOS (safari, disabled)	1m 31s
Test Build	30s
Test Browser on macOS (safari, default)	1m 33s
Test Browser on macOS (safari, main)	1m 0s
Test Browser on Linux (firefox, disabled)	1m 38s
Test Shell (jsc, default)	3m 9s
Test Browser on Linux (chrome, main)	45s
Test Browser on Linux (chrome, default)	1m 10s
Test Browser on Linux (firefox, main)	1m 2s
Test Browser on Linux (chrome, disabled)	1m 4s
Test Shell (v8, disabled)	1m 37s
Test Shell (spidermonkey, disabled)	2m 6s
Test Shell (jsc, disabled)	1m 51s
Test Shell (v8, default)	2m 44s
Test Shell (jsc, main)	44s
Test Shell (spidermonkey, default)	5m 20s
Test Shell (spidermonkey, main)	49s
Test Browser on Linux (firefox, default)	1m 46s
Test Shell (v8, main)	45s
	31m 4s

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