GET ALL jumbles the player's inventory slightly.

[Andrew Schultz]

Formicidae example:

Rule for deciding whether all includes the ant colony while taking: it does not.

So I'd guess...

Rule for deciding whether all includes a thing: if pen case contains noun, it does not;

It's just slightly nicer to see the inventory indented a bit and the "take all" not scrambling it.

[Daniel Stelzer]

Fixed.