- PSEUDOVECTOR_FLAG bit set, and exactly one of the following bits to
- indicate the actual type.
- We use a bitset, even tho only one of the bits can be set at any
- particular time just so as to be able to use micro-optimizations such as
- testing membership of a particular subset of pseudovectors in Fequal.
- It is not crucial, but there are plenty of bits here, so why not do it? */
+ PSEUDOVECTOR_FLAG bit set, and one of the following values extracted
+ with PVEC_TYPE_MASK to indicate the actual type. */