I want to create a buffer with the layout

0           4           8           12      13      14      15      16
[   x:Float   |   y:Float   |   z:Float   | r:UInt8 | g:UInt8 | b:UInt8 |
_:UInt8 ]

Normally, I’d use UnsafeRawBufferPointer for this, but I need the buffer to
be a vector (i.e. with append(_:)), and for it to return a Swift-managed
Array<UInt8>. How should I do this? The project does not use Foundation.
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