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If node::Buffer::New() is used to wrap an existing chunk of memory without providing a custom callback to release that memory then Node will just use `free()`. In a couple of places Node buffer objects were constructed from chunks of memory that were allocated with `new[]`, but a custom callback to release that memory was omitted, this resulted in undefined behavior when those buffers were destroyed because `free()` was used to release memory allocated with `new[]`. To avoid undefined behavior the aforementioned buffer objects are now constructed with a custom callback that safely releases the underlying chunk of memory.