When I set the width to Col and put in a fractional value I get the following error. However, it still functions as expected in spite of the error - the width is set correctly.
Hey Bradly, thanks for pointing this out 
This looks like a type error, but it works because we attempt to parse the input as a number anyways. If you pass in {{ 0.75 }} it will be parsed as a number and shouldn't throw this error.