How to do correct number formatting in dijit/form/NumberTextBox?

Question

JavaScript

Hello.
Essence of a question:
I use Dojo for a client part of application. Server side in Java (Spring MVC). I draw a form, a NumberTextBox is dynamically drawn on the form to display a number with the Double type. The number comes from the server as 55.01, for example. As a pattern for the widget, #,## is set (namely, a comma as a separator of the integer and fractional parts, because the locale is ru). Since the number comes as a number, it comes with a dot as a separator, and the widget draws only the integer part for me, and rounds it up, since after casting to a string I don’t get into the pattern.
If you set a pattern like #.##, then at the first rendering everything is drawn, but if you change the value, then client validation does not pass, because in the Russian locale, the separator is still a comma (if you change the locale to En in the browser, everything works fine).
The real question is how to make this thing work correctly, regardless of the locale? I tried to set different patterns, it did not help. Passing a number as a string to the client is also not suitable.
If anyone has encountered such a problem (maybe not necessarily in dojo, in other JS frameworks), tell me how did you solve it?
Thank you for your attention.