Ben A

I though JSON had 8 types, string, number, null, boolean, array, value, object, and whitespace. Source
Also, Javascript is far from typeless, it's dynamic (explanation).

(Sorry if I'm being a bit annoying, just wondering why this is the case)

Ah, that makes more sense. Why is it not JSON? Can I suggest an improvement for it to be JSON?

Sorry, just tested that,

slot:1

works, too.

Chest:

/blockdata ~ ~ ~-1 {Items:[{Slot:3,id:"minecraft:dirt",Count:3,Damage:2}]}

@Skylinerw `"Slot":true` and `"Slot":false` work fine.

It is represented as JSON.

The screen shot shows which dye produces which color wool.