People , who live within latin1 encoding made a mistakes according to different locales and cultures.
In case of flex sdk 4 I found following error: Number as model, NumberValidator , TextInput and BindingUtils in Russian locale, that has a , (comma) as decimal separator , inposible to input real number. The scenario is : user input, decimal separator, NumberValidation validate it in correct way, but BindingUtils can not convert text with comma to Number and set NaN value to target Number field and value in TextInput became a string NaN and validator can not pass this value :)
LOL !!! After registration in adobe jira, i can not login to post the bug
upd: bug is created http://bugs.adobe.com/jira/browse/SDK-26785