pub type OperandVec<T> = TinyVec<[T; 5]>;
Inline vector of at most OPERAND_CAP operands (strides, offsets, …).
OPERAND_CAP
pub enum OperandVec<T> { Inline(ArrayVec<[T; 5]>), Heap(Vec<<[T; 5] as Array>::Item>), }