# v4/ StarForth v4: the 32-instruction F18-derived core. The design lives in `docs/v4.0.0/JUSTIFICATION.md` (why) and `docs/v4.0.0/DECOMPOSITION.md` (every v3 word mapped to a v4 fate). There is no code yet. The first deliverable is the hosted C99 golden model (`JUSTIFICATION.md` §10, step 1). It must pass POST and hold K≡1.0 with 32- and 64-bit cells on all three host ISAs.