Feature request: printf

I often find myself having to do:
$m->print(sprintf('some pattern', $var1, $var2));

It would be really nice to have $m->printf just as a shortcut.

The function seems simple, and I would have submitted a patch,
but the test kit was taking too long to wrap my head around, and
I know you much prefer patches with tests. 

# Request.pm
sub printf {
    my $self = shift;
    $self->print(sprintf(shift, @_));
}



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