I come from Russia which is an extremely low bar with respect to human rights, however giving up a citizen to a foreign government is explicitly forbidden by the constitution. It's a very reasonable rule because by doing so you're effectively stripping him of constitutional protections (which sadly don't exist anymore but they did in the past).
I always assumed all decent countries have that, and of all especially the USA which is famous for things like "The Hague Invasion Act".
I believe it could be surprising because a person's government has turned them over to a foreign government where they have no representation. The foreign government is not governed by the same Constitution, Bill of Rights, laws, or checks and balances. A core cultural understanding in the US is the rule of law and right of representation in a government by-and-for the people. It could seem like a loophole where the US government can forcibly remove a person's rights.
