In Penknife, respected linearity in `is-a-struct` and `is-a-comparable-token`, and added `get-tag-name`, `struct-get-args`, `is-a-name`, and `name-eq`. Added several derived utilities to the prelude, and some are on standby due to stack overflow errors.
In Penknife, fixed `is-a-comparable-token`, which used a broken calling convention.