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  C routines as \dQuote{function pointers} in C.
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  C routines as \dQuote{function pointers} in C.
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  This allows us to treat native routines and R functions
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  This allows us to treat native routines and R functions
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  in a similar manner, such as when passing an R function
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  in a similar manner, such as when passing an R function
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  to C code that makes callbacks to that function
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  to C code that makes callbacks to that function
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  at different points in its computation
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  at different points in its computation
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  (e.g., \code{\link[nls:nls]{nls}}).
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  (e.g., \code{\link[stats]{nls}}).
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  Additionally, we can resolve the symbol just once and
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  Additionally, we can resolve the symbol just once and
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  avoid resolving it repeatedly or using the internal
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  avoid resolving it repeatedly or using the internal
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  cache.
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  cache.
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  In the future, one may be able to treat \code{NativeSymbol}
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  In the future, one may be able to treat \code{NativeSymbol}
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  objects as directly callback objects.
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  objects as directly callback objects.