err, it's not a library, it's a full implementation of Arc.
I'll probably also include some method of locking the global (and only the global) but only with a lot of big warning signs around the locking function, saying that this should be used only if efficiency is a real concern. Also, my intended lock is a true lock: no redefinition of the <edit>global</edit> at all.
Also, ssyntax could potentially help with the apparently long symeval!foo form; say: <>foo maybe?
