I've learned this the hard way, and I've had to learn it several times because I
am a slow learner. I've posted this before, and repeat it because bears repeating.
The procedure is:
1. pass the test suite
2. prep the file for conversion, i.e. try to minimize the use of idioms that
won't easily translate
3. pass the test suite
4. translate the code with as few edits as practical. Do not reformat the code.
Do not refactor it. Do not fix anything, no matter how tempting. Reproduce the
behavior of the original as much as possible.
5. pass the test suite
6. now reformat, refactor, fix (as separate PRs, of course, and passing the test
suite in between each).
7. pass the test suite
Note that without a test suite, you're doomed :-)
