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feat: `FlatList` module with the vocabulary of the FSharp.Core `Array` module #93

Job	Run time
build-devcontainer	1m 57s
build (Debug, ubuntu-latest)	1m 2s
build (Release, macOS-latest)	1m 29s
build (Release, windows-latest)	1m 43s
build (Debug, windows-latest)	2m 38s
build (Debug, macOS-latest)	1m 13s
build (Release, ubuntu-latest)	1m 13s
	11m 15s