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V8 Utf8Value - npm install breaking #37

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@jadbox

Node 12.3.1

error: no matching function for call to ‘v8::String::Utf8Value::Utf8Value(v8::Local<v8::Value>&)’
   17 |   v8::String::Utf8Value string(value);
In file included from ../src/create_string.cpp:1:
../../nan/nan.h: In function ‘void Nan::AsyncQueueWorker(Nan::AsyncWorker*)’:
../../nan/nan.h:2298:62: warning: cast between incompatible function types from ‘void (*)(uv_work_t*)’ {aka ‘void (*)(uv_work_s*)’} to ‘uv_after_work_cb’ {aka ‘void (*)(uv_work_s*, int)’} [-Wcast-function-type]
 2298 |     , reinterpret_cast<uv_after_work_cb>(AsyncExecuteComplete)
      |                                                              ^
../src/create_string.cpp: In function ‘char* create_string(Nan::MaybeLocal<v8::Value>)’:
../src/create_string.cpp:17:37: error: no matching function for call to ‘v8::String::Utf8Value::Utf8Value(v8::Local<v8::Value>&)’
   17 |   v8::String::Utf8Value string(value);
      |                                     ^
In file included from /home/jdunlap/.node-gyp/12.3.1/include/node/node.h:63,
                 from ../../nan/nan.h:54,
                 from ../src/create_string.cpp:1:
/home/jdunlap/.node-gyp/12.3.1/include/node/v8.h:2995:5: note: candidate: ‘v8::String::Utf8Value::Utf8Value(v8::Isolate*, v8::Local<v8::Value>)’
 2995 |     Utf8Value(Isolate* isolate, Local<v8::Value> obj);
      |     ^~~~~~~~~
/home/jdunlap/.node-gyp/12.3.1/include/node/v8.h:2995:5: note:   candidate expects 2 arguments, 1 provided
/home/jdunlap/.node-gyp/12.3.1/include/node/v8.h: In instantiation of ‘void v8::PersistentBase<T>::SetWeak(P*, typename v8::WeakCallbackInfo<P>::Callback, v8::WeakCallbackType) [with P = node::ObjectWrap; T = v8::Object; typename v8::WeakCallbackInfo<P>::Callback = void (*)(const v8::WeakCallbackInfo<node::ObjectWrap>&)]’:
/home/jdunlap/.node-gyp/12.3.1/include/node/node_object_wrap.h:84:78:   required from here
/home/jdunlap/.node-gyp/12.3.1/include/node/v8.h:9817:16: warning: cast between incompatible function types from ‘v8::WeakCallbackInfo<node::ObjectWrap>::Callback’ {aka ‘void (*)(const v8::WeakCallbackInfo<node::ObjectWrap>&)’} to ‘Callback’ {aka ‘void (*)(const v8::WeakCallbackInfo<void>&)’} [-Wcast-function-type]
 9817 |                reinterpret_cast<Callback>(callback), type)

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