Attempt to include eigen-based LU decomposition. #220

Job	Run time
macOS Sonoma Python 3.13 arm64	6m 44s
macOS Sonoma Python 3.12 arm64	6m 37s
macOS Sonoma Python 3.11 arm64	6m 40s
macOS Ventura Python 3.10 arm64 (cross)	22m 21s
macOS Ventura Python 3.9 arm64 (cross)	16m 7s
macOS Ventura Python 3.8 arm64 (cross)	23m 0s
macOS Ventura Python 3.7 arm64 (cross)	14m 36s
macOS Ventura Python 3.6 arm64 (cross)	13m 51s
macOS Ventura Python 3.13 x86_64	10m 51s
macOS Ventura Python 3.12 x86_64	14m 9s
macOS Ventura Python 3.11 x86_64	19m 20s
macOS Ventura Python 3.10 x86_64	14m 57s
macOS Ventura Python 3.9 x86_64	9m 28s
macOS Ventura Python 3.8 x86_64	16m 27s
macOS Ventura Python 3.7 x86_64	12m 29s
macOS Ventura Python 3.6 x86_64	13m 1s
	3h 40m 38s

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