fix to allow positional vararg eg. fn(a...; kw)
          #138
        
          
      
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Since the function construction inget_slotsis only used to get slot names, always pretend the final positional arg is non-splat. This prevents the error from trying to constructfn(a..., kw), and otherwise has no impact since the slot names themselves remain the same.Resolves #135(This was largely based on false assumptions it turns out. I'll see if there's anything salvageable here, and if not then close this PR.)