Uses fold+reduce for handling duplicate pubkeys during index generati… #413

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	6m 29s
ios (macos-11, aarch64-apple-ios)	6m 28s
android (ubuntu-20.04, aarch64-linux-android)	3m 5s
android (ubuntu-20.04, i686-linux-android)	6m 40s
ios (macos-11, x86_64-apple-ios)	5m 45s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 15s
ios (macos-11, aarch64-apple-darwin)	6m 24s
ios (macos-11, x86_64-apple-darwin)	6m 6s
error_reporting	0s
	44m 12s

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