Primitive substitution in the minifig arm

[Magnus Forsberg]

... do we have evidence that there are two sleeve heights???

AFAIK, no.
You have to look at these subfiles as coming from two different parts.
One single-mould (3818s01-s04) and one dual-mould (3818p01s01-p01s06).

Maybe we should renumber the dual-mould part to a uXXXX-number?

Or, digging in LDD revealed that the numbers are:

16360, complete torso with dual moulded arms
16000, dual moulded right arm
16001, dual moulded left arm

These numbers are already present in the ldraw.xml file.