Avoid 2 levels of indirection, and having to allocate twice for small
payloads, by having an inlined array on the vector directly!
Beautiful and simple.
Required a bit of refactoring around the board, but overall the result
makes me feel happier.
Stable vectors will be used in the lisp runtime to implement actual
vectors, instead of using the disgusting lvec trick. This way we at
least can get attributes about the vector through one pointer hop.
I'm going to implement a normal stable vector instead of an inline
vector so we have both options for use. I think that's smarter than
just sticking to one.
