Adding grow and shrink options for flex?

[murphyjoseph]

Is there a particular reason that flex grow and shrink were completely omitted from this library? I find that functionality to be pretty important to be able to control. Is there a possibility it could get added?

*edit - should say that shrink isn't entirely omitted. I'm more so getting at the ability to customize whether something can grow or shrink similar to how you can do flex1 - flex12. Might be nice to do at least flexNoGrow or something like that at least.