No overload found in numerical_diff namespace

[ovdiiuv]

Reproducer:

//Compile with clang -std=c++11 -I /path/to/include -fplugin=/path/to/clad.so -Xclang -plugin-arg-clad -Xclang -fgenerate-source-file -lm
#include "clad/Differentiator/Differentiator.h"

inline double LnGamma(double x) { return std::lgamma(x); }

int main(){
   clad::gradient(LnGamma);
}

Compiling the source file would give us:

Derivatives.cpp:7:20: error: no matching function for call to 'forward_central_difference'
    7 |         _r0 += 1 * numerical_diff::forward_central_difference(std::lgamma, x, 0, 0, x);