I suggest to list all tools/extensions in alphabetical order and maybe split the tables by category.
This will make the repo more organized and easy to read.

Currently, a seed value is required for foldl which in turn causes aggregate to require a seed value. The functions should be able to be used both with and without a seed value. Additionally, the seed value appears to be misnamed as memo. This should be changed to something more suitable.

Unit tests should be added for these as well. #2 is close to being merged and presumably will have be

As title, this may be useful.

See https://docs.unity3d.com/Manual/Packages.html.