[v3] conditional tweak

[Gabriel Dos Reis]

Martin Sebor <sebor@roguewave.com> writes:

| Gabriel Dos Reis wrote:
| 
| ...
| > | This conditional actually does happen to have a significant impact
| > | on performance -- fill() is called every time a number is inserted
| > | into a stream, for example.
| > compared to the actual work for formatting?
| 
| Believe it or not (although it depends if you consider an improvement

I always consider actual data.

-- Gaby