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Prevent Buffer bytes from being garbage collected prematurely

Clients can request access to the internal bytes held onto by a
buffer. It is possible for a user to still be holding onto the bytes
when the Buffer goes out of scope and thus eligible for garbage
collection. This would immediately clear the bytes held onto by the
user.

To prevent serious data-loss bugs, the bytes now hold on to a pointer to
their parent Buffer. This prevents the Buffer from being garbage
collected (and thus the bytes from being cleared) as long as there still
exists a pointer to the bytes themselves.

3 of 3 new or added lines in 1 file covered. (100.0%)

525 of 529 relevant lines covered (99.24%)

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