Comment by JoshTriplett

Code submitted to a project should follow the formatting standards of that project and its programming language, which doesn't leave much room for flexibility in whitespace. However, there are many ways to write comments, and many ways to write PR descriptions and commit messages, and often many choices of words to name identifiers, and other potential sources of bits of entropy with no functional impact. It doesn't take that many bits to encode a robust "AI was here" indicator.