For 6.5.2 and browser set to de_DE, the built-in number converter reacts different from previous versions and other locales.
It ignores the "percent" feature of decimal format and also the standard decimal separator is wrong.
Steps to reproduce:
Run the attached MVVM page with 6.0.x and 6.5.2-FL with de_DE and en_US. Check the displayed double value in the second line.
For me it displays:
18.104.22.168 2012090617 de_DE
6.5.2-FL 2013031817 de_DE
6.5.2-FL 2013031817 en_US