Update regarding the use of key argument at min() method

[napakalas]

#154

[dbrnz]

Yes, much clearer with using a lambda.

BTW, I've learnt that best practise is to annotate with # pyright: ignore[reportXXX] (where reportXXX is the particular class of error as reported by PyRight (e.g. reportCallIssue)), instead of the generic # type: ignore.