This is the right answer. I worked in clinical trials for a while, and they're required to submit a Statistical Analysis Plan before the study is even allowed

This is the right answer. I worked in clinical trials for a while, and they're required to submit a Statistical Analysis Plan before the study is even allowed to proceed. After all the data are collected, you just run whatever was originally proposed and you get the answer you get. This really should be the standard for any meaningful science.