Review: std.logger

[Dragos Carp via Digitalmars-d]

> Basically, limiting to string format logging limits to thinking 
> of logging
> as purely strings.  Using an API of 'list of items' decouples 
> it to the
> more abstract 'logging stuff', with the actual string only 
> mattering for
> final output.

This is really valid point.
There is still a problem: the analogy, that log/logf is similar
to write/writef, is not right anymore. Please correct me if I'm
wrong... but AFAIK write converts every argument to string and
the output device has no mean to choose a preferred
representation of the arguments.

It will be a surprise if I replace
    log(a, b, c);
with
    logf("%s%s%s", a, b, c);
and possibly get different results.