Handling of word spaces with new Text Styling options

Current constructs to not allow for control of word spaces - they all get nuked or ignored, by default.

As an example - 

We start with - 

Today has been a busy day.

If I then set my range to select words 2 and 3 with the intention of animating its fontSize via a Slider Control and starting from 0 to 50 with 50 also being the size of the base style; when fontSize is at 0, this is the result - 

Todaya busy day.

This of course sucks like a drenched cigar. So, I'm thinking of a way to control word spaces and thought we could have an "extends" a bit like how sourceRectAtTime() uses extends. The possible arguments for "extends" to work with affected properties in the text.sourceText prop is as follows - 

fontSize(mySlider,startValue,length,true,1)

Where "true" means, word spaces will be retained and the number (1 in this case) specifies the number of word spaces to use/retain. 

So, when animating fontSize, I will be able to hook up the "1", the number of wordspaces value to a Slider Control and also animate it but going from 1 to 0. With this construct, with my specified set up, when fontSize is at 0, this will be the result - 

Today a busy day.