Add ruby 3 compatibility.

[bsa7]

After the release of Ruby 3, the division into positional and named arguments has changed.
Because of this, memoization of some functions became impossible.

This pull request addresses the compatibility issue and also adds coverage for some cases.

[pboling]

FYI: Added this alert to the new memoist repo

Important

Recommendation

Consider using MemoWise instead, as it is maintained, fully tested, provides thread safety guarantees, and is much, much faster.

Other Alternatives

In case you need a tool with this feature set that is currently maintained, check out:

• https://github.com/makandra/memoized
• https://github.com/honzasterba/memoist
• https://github.com/AlexWayfer/alt_memery

Tip

Seriously though, read the important note above.

Warning

If you must continue - be aware that this is unmaintained software.