Rounding does not fix character limit validation

Rounding does not fix character limit validation

Following this update ("Announcing strict validation for the max character length field property"), I have been working to fix character limits in my forms. 

I have introduced this code:
  1. input.Actual_Work_Time = input.Actual_Work_Time.round(11);
The code is working, because (for example) it is changing 42.031111111111111 to 42.031111111110000.

However, I still get the form validation error message "Actual Work Time value can only be up to 16 digits".

So it seems that Zoho is adding zeroes that are breaking the character limit.

How do I fix this?

Thank you.