Where is std::put used in the existing standard library?  I can't seem to find it.  (0 matches on codesearch.isocpp.org. not found on cppreference)

There's a std::puts inherited from C.  The s stands for string and it does something similar to what we're trying to do:

  https://en.cppreference.com/w/cpp/io/c/puts

even outputs an implicit newline.

So I was thinking we could propose that:

    std::put(1,2,3);

is equivalent to:

   std::println("{} {} {}", 1, 2, 3);

and forget about all the other forms.