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Use a single dispatch queue for all internal code, dispatch work on i… #942

Job	Run time
Lint Podspec for ios	1m 53s
Integration (iOS 15.2, Xcode 13.2.1)	4m 34s
Lint Podspec for ios	1m 38s
Unit (iOS 15.2, Xcode 13.2.1)	10m 30s
Lint Podspec for osx	1m 47s
Lint Podspec for tvos	1m 35s
Unit (macOS 12.1, Xcode 13.2.1)	8m 44s
Lint Podspec for watchos	1m 48s
Unit (watchOS 8.3, Xcode 13.2.1)	7m 45s
Unit (tvOS 15.2, Xcode 13.2.1)	8m 40s
ObjC demo (iOS ${{ matrix.version.ios }})	0s
Iglu Central (SPM) (iOS ${{ matrix.version.ios }})	0s
Swift demo (Cocoapods) (iOS ${{ matrix.version.ios }})	0s
Swift demo (SPM) (iOS ${{ matrix.version.ios }})	0s
	48m 54s

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