In fact, every line of your source has several comments! Which may or may not really apply! BOTH are needed IMHO, comments must be able to communicate knowledg

In fact, every line of your source has several comments! Which may or may not really apply! BOTH are needed IMHO, comments must be able to communicate knowledge a reader of the code-as-a-whole needs to know, and commit messages must be able to communicate knowledge a reviewer of the change needs to know.