[DDoSolitary]

On arm char is unsigned and and narrowing conversion in list initialization is strictly ill-formed in c++

Error:

/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:21: error: constant expression evaluates to -58 which cannot be narrowed to type 'char' [-Wc++11-narrowing]
   11 |   std::string input{-58, -1, -99, 109};
      |                     ^~~
/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:21: note: insert an explicit cast to silence this issue
   11 |   std::string input{-58, -1, -99, 109};
      |                     ^~~
      |                     static_cast<char>( )
/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:26: error: constant expression evaluates to -1 which cannot be narrowed to type 'char' [-Wc++11-narrowing]
   11 |   std::string input{-58, -1, -99, 109};
      |                          ^~
/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:26: note: insert an explicit cast to silence this issue
   11 |   std::string input{-58, -1, -99, 109};
      |                          ^~
      |                          static_cast<char>( )
/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:30: error: constant expression evaluates to -99 which cannot be narrowed to type 'char' [-Wc++11-narrowing]
   11 |   std::string input{-58, -1, -99, 109};
      |                              ^~~
/home/ddosolitary/yaml-cpp/test/binary_test.cpp:11:30: note: insert an explicit cast to silence this issue
   11 |   std::string input{-58, -1, -99, 109};
      |                              ^~~
      |                              static_cast<char>( )
3 errors generated.

Minimal reproducer: https://godbolt.org/z/rE5cGsWKM