I mostly live in C++ land and the story is different there. The standard library implementations are a place of magick, mystery, and obscure defect reports. They provide plenty of insight what can go wrong if you are writing a generic library and how difficult correctly programming with templates actually is, but all the technicalities of the language make it hard to see the algorithms. They are definitely worth reading, but only if you have mastered a large amount of C++.

Not to mention the horrible naming conventions (leading double underscores everywhere).

I often think about a C++ standard library written for educational purposes with proper naming, focus on readability instead of optimization, and maybe multiple possible implementations of certain specs.