Motivation:
Accessing the native address, if a buffer has any, violates the no-aliasing rule for Buffers.
Also, it inherently assumes that a buffer has a single, native memory allocation.
The native address, or addresses, are already available via the Readable- and WritableComponents.
Accessing these via forEachReadable and forEachWritable will also ensure that composite buffers will be handled correctly.
Modification:
Remove the nativeAddress() method from the Buffer API.
Update the ByteBufAdaptor and a few tests to cope with this change.
Result:
Less error prone code, and make unsafe APIs a bit more hidden.
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