An update on this: I tried undoing the migration the next day, and it worked! Everything on my main account was restored, including the TV app’s 'Continue Watching' and Watchlist feeds. Kudos to Apple—the undo function actually worked, which was a pleasant surprise.
Be warned: I migrated an old Apple account to my main Apple account and my “Continue Watching”/Watchlist in the TV App got totally cleared. It also forgot every Apple TV episode I have ever watched.
Super frustrating and it won’t let me undo the migration right now either.
Also, one of the hardest-hitting quotes from his book, Permanent Record:
"There is, simply, no way, to ignore privacy. Because a citizenry’s freedoms are interdependent, to surrender your own privacy is really to surrender everyone’s. You might choose to give it up out of convenience, or under the popular pretext that privacy is only required by those who have something to hide. But saying that you don’t need or want privacy because you have nothing to hide is to assume that no one should have, or could have to hide anything – including their immigration status, unemployment history, financial history, and health records. You’re assuming that no one, including yourself, might object to revealing to anyone information about their religious beliefs, political affiliations and sexual activities, as casually as some choose to reveal their movie and music tastes and reading preferences.
Ultimately, saying that you don’t care about privacy because you have nothing to hide is no different from saying you don’t care about freedom of speech because you have nothing to say. Or that you don’t care about freedom of the press because you don’t like to read. Or that you don’t care about freedom of religion because you don’t believe in God. Or that you don’t care about the freedom to peaceably assemble because you’re a lazy, antisocial agoraphobe. Just because this or that freedom might not have meaning to you today doesn’t mean that that it doesn’t or won’t have meaning tomorrow, to you, or to your neighbor – or to the crowds of principled dissidents I was following on my phone who were protesting halfway across the planet, hoping to gain just a fraction of the freedom that my country was busily dismantling."
The Burst compiler is closed source. However, if you import the Burst package [1] into your Unity project, you can see most of the source using ILSpy [2].
In your project, see the directory: "Library/PackageCache/com.unity.burst@<package-version-here>/.Runtime". The DLLs you'll want to inspect are: "Burst.Backend.dll", "Burst.Compiler.IL.dll", "burst-llvm.dll", "Smash.dll" and possibly the "Cecil" DLLs.