Only the tests

We follow tally, a word counter, through the three places where its tests matter. We see it before any test, then when the tests come, and last when new code comes with a test of its own. Every command runs through uv.

Each part ends with a section called What changed. It lists every file that the part changes, with a link to the file, and then the whole diff of each file, folded. A lockfile and a binary file have a link alone. The text above it explains the change.