FormatInt doesn't write out to a buffer and doesn't pad the output with zeros, so it's going to lose out nontrivially in actual use. I have tested some FormatI

FormatInt doesn't write out to a buffer and doesn't pad the output with zeros, so it's going to lose out nontrivially in actual use. I have tested some FormatInt-like code that does do those things; if I recall the results correctly, the article's is slightly faster with unpredictable sizes and significantly faster with predictable sizes.