The values are bitfields laid as follows:
-nnnn nn_f _sss _ccc
- │ │ │ └╴Number of components
+nnnn nn_f _sss rccc
+ │ │ │ │ └╴Number of components
+ │ │ │ └───╴Reverse order flag
│ │ └─────╴Size of one component
│ └──────────╴Floating-point flag
└────────────╴Attachment index