Try to transfer all inner types V strictly onto value types.

### There are some kind of suggestions:

1. `ref / readonly ref`;
2. `Span / Memory`.

**Main sense is to increase performance, having made an inner type to be stored on stack memory.**

The issue names no source files, tests, or entry points. Start by inspecting the repository structure and current inner-type definitions, then determine the required representation and performance criteria before deciding what tests would demonstrate that the refactor is complete.

Written by the indexing model from the issue text.