Rationale for two C++ features

Hi,

I'm curious what the rationale was for two
oddities in C++.

1) Why did the standards committee choose
the oddball no-extension names for the standard
headers (<string>, e.g.)?  I can understand them wanting to
emphasize that an included entity is not necessarily
a file, but they say "header file" throughout the standard,
and calling it something like "string.hpp" would not have implied
that it was necessarily a file.


2) Why was the following use of the conditional operator
made illegal?

 class B             { };
 class D1 : public B { };
 class D2 : public B { };
 int main(int argc, char **argv) {
     B *p1 = argc == 1 ? new D1() : new B();
     B *p2 = argc == 1 ? new D1() : new D2();
 }

In the code above, the p1 assignment is legal,
while the p2 assignment is not (according to
the standard's expr.cond.5, and the Comeau
and GNU compilers I tried).  Why not just
treat it as the following:

 B *p2;
 if (argc == 1)
     p2 = new D1();
 else
     p2 = new D2();

Thanks,
Sean