Sun-Abraham methodology review: fix 5 issues, add R benchmarks #247

Job	Run time
Pure Python Fallback	47m 43s
Rust Unit Tests (ubuntu-latest)	1m 8s
Python Tests (ubuntu-latest)	8m 36s
Python Tests (macos-latest)	5m 13s
Rust Unit Tests (windows-latest)	2m 58s
Rust Unit Tests (macos-latest)	1m 47s
Python Tests (windows-latest)	11m 2s
	1h 18m 27s

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