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src: don't SetInternalField() in ObjectWrap dtor
Call SetPointerInInternalField(0, NULL) rather than SetInternalField(0, Undefined()). Fixes the following spurious NULL pointer dereference in debug builds: #0 0x03ad2821 in v8::internal::FixedArrayBase::length () #1 0x03ad1dfc in v8::internal::FixedArray::get () #2 0x03ae05dd in v8::internal::Context::global_object () #3 0x03b6b87d in v8::internal::Context::builtins () #4 0x03ae1871 in v8::internal::Isolate::js_builtins_object () #5 0x03ab4fab in v8::CallV8HeapFunction () #6 0x03ab4d4a in v8::Value::Equals () #7 0x03b4f38b in CheckEqualsHelper () #8 0x03ac0f4b in v8::Object::SetInternalField () #9 0x06a99ddd in node::ObjectWrap::~ObjectWrap () #10 0x06a8b051 in node::Buffer::~Buffer () #11 0x06a8afbb in node::Buffer::~Buffer () #12 0x06a8af5e in node::Buffer::~Buffer () #13 0x06a9e569 in node::ObjectWrap::WeakCallback ()
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