a couple of questions on Flexbox

Tab,
   I have a couple of simple questions that the current Flexbox draft does not seem to answer:

1.       Are the first two values of the "flex()" function "numbers" or "lengths", meaning in the latter case that they would be specified using "fl" units. I assume that they are numbers, but that is likely to produce some mental strain when, without the "flex()" function, the author specifies "fl" units and, with it, for the same purpose, he specifies numbers.

2.       I find the characterization of "available free space" a bit too abstruse. I am not sure what "inner width" refers to as it is only used here and is not a box model term. I also find the characterization of "relevant length" to be confusing; just how are the "packing spaces" used in this comutation.

What I am confused about is when and whether the packing spaces are used in the "available free space" computation so that having passes "1" and "2" make sense to me. (I do know that pass "2" is there to handle the "flex-pack" values.)


Steve Zilles