Update the status, strictness levels, and open questions to reflect what
landed: bounded unions (jolt-pz5), user-fn domains behind
JOLT_TYPE_CHECK_USER (jolt-zo1), precise file:line:col (jolt-fqy), and the
checker folded into one inference walk that piggybacks on direct-link
specialization (on by default there, opt-in in plain builds). Align the
error-reporting example with the actual output format.
0005 proposes replacing the ad-hoc inference lattice with one recursive
structural type (a struct carries its field types, a vector its element type,
recursively), so a lookup returns its field's type and nested access is typed
end to end. It unifies :struct tracking with field tracking, subsumes the
current inference phases, and is the soft-typing (HM + a dynamic top) design:
structural types + core-fn type schemes, solved by lattice join with :any as
top instead of unify-or-fail. Includes the depth cap for termination and an
explicit design-problems section.
0006 (follow-up, depends on 0005) reuses the inference as a loose type checker
in the success-typing discipline (Dialyzer): report only PROVABLY-wrong code
(a concrete type in an operation's throwing error-domain), accept everything
ambiguous, never a false positive. Curated error-domain table, strictness
levels (off/warn/error), clear located messages, and the soundness boundaries
(closed-world, macros, unions).
