Leverage Base reduction functions for sum #57

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	34s
Julia nightly - windows-latest - x64 - pull_request	1m 22s
Julia 1.6 - macOS-latest - x64 - pull_request	2m 15s
Julia 1.6 - windows-latest - x64 - pull_request	12m 1s
Julia nightly - ubuntu-latest - x64 - pull_request	32s
Julia nightly - macOS-latest - x64 - pull_request	2m 46s
	19m 30s

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