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\item since an {\tt feval} is executed through the interpreter, in the original functions arguments are boxed to make them more generic before the call.  \end{enumerate}  The first one is a major source of inefficiency for the OSR-based approach, since the benefits from replacing the call to the interpreter's {\tt feval} dispatcher with a direct call are limited compared to the optimization opportunities deriving from a better type inference on the whole body of the function. In fact, instructions operating on generic-type variables are much less efficient than their counterparts for [arrays of] primitive types, as they operate on boxed values.  Lameed and Hendren conclude their paper by stating that ``It would be interesting to look at future work that combine the  strengths of both approaches".