Fix cpp type transmutation#2
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Storing non-POD types in char buffers is unsafe. * Ensure alignments are compatible with desired type. * Ensure raw data is copied with memcpy Otherwise, the list entries are created raw and placement-constructed as one type, which is changed when they're copied by the copy constructor of T (different type). For POD data this wouldn't matter, but here it changes the vtable pointer and indirectly causes an OOB write.
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