Hello Alexander,
Thank you for contacting us. It seems like a bug on our side - especially the NaN or undefined values. I think that I managed to reproduce the problem in this sample - can you please verify that we talk about the same thing?
I will file the problem in our bug tracker, we will try to address it for our next internal build. I am also updating your telerik points for this finding.
Regards,
Petyo
Telerik
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