dylan-lang/opendylan — pull request #364 by waywardmonkeys (2012-12-11 10:43:28+00:00)
Title: Improve performance of format-date().

Previously, this was doing a lot of concatenation and reallocation.
Using a stream with a pre-sized string contents lets us avoid
much of that.

(This could be improved further, but this was an easy win...)