iostream _sucks_, I had to implement an iostream for zlib + DEFLATE in order to play ball with an iostream-based library, and I had to sweat blood and tears in order to make it work right when a simple loop and a bit of templated code would have worked wonders compared to that sheer insanity of `gptr`, `pubsync`, ... The moment you notice that they've methods called "pubXXX" that call a protected "XXX" on the `basic_streambuf` class is the moment your soul leaves your body.

IOStreams is superbad, and thankfully <format> removes half of its usages which were based on spamming `stringstream`s everywhere (stringstream is also very, very bad). They also inspired Java's InputStream nonsense which ruined the existence of an innumerable number of developers in the last 30 years.