[lispm]

Why would arguments in Lisp (= "list processor") form a vector?

Is it so that the syntax of vectors can be used? Then it has technical consequences.

Is it because of technical issues (arguments are vectors internally) and thus it can be exposed in the syntax, too?

Or both?

[Zak]

I think the motivation for making the sequence of arguments in function/macro definitions vectors instead of lists was primarily syntactic - to make them look different from the body. They're definitely vectors internally though.