Right now it is using printf("%f") and has the problem with non-english locales because they can have another decimal separators. The problem was temporary resolved for comma separator by hack. See https://bugs.webkit.org/show_bug.cgi?id=42755
This is a duplication of 18994. Let the bug open so that we won't forget to eliminate the hack, once the locale problem got fixed.
Created attachment 71033 [details] [patch] initial version.
Comment on attachment 71033 [details] [patch] initial version. Clearing flags on attachment: 71033 Committed r69959: <http://trac.webkit.org/changeset/69959>
All reviewed patches have been landed. Closing bug.