[Bug libstdc++/65840] type of result of at least some libstdc++ xmethods is different than real operator

[dje at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65840

--- Comment #2 from Doug Evans <dje at google dot com> ---
I think it should be more than just a matter of working in practice.

A user may get confused by the difference in the type and wonder if time needs
to be spent investigating the difference. Tools shouldn't do this to users.