RE: [css3-flexbox] ED updated: algorithms and 'flex' property

About the naming: what about "neutral size" or "unconstrained size"? 

By that wording, I intend to mean that it's the size the object has if he isn't affected by a strain (either to grow or shrink to fit a constrain). 

We may want to use a similar wording as the one used in civil engineering about the traction-compression of segmented beams, with naming like relative compressibility. If a consistent naming has already been created for a similar purpose, why not reuse it?

Just a thought,
François 

BTW what's the point of having a different neutral size than width*height? It doesn't seems obvious to me.