No mature Chez fibers library exists and this is a threaded Chez build, so a go
block is an OS thread and a channel is a mutex+condition blocking queue: <! / >!
are the blocking <!! / >!! and work anywhere (no CPS transform), like the Janet
stackful-fiber model but with real parallelism and a shared heap.
host/chez/async.ss provides chan (unbuffered rendezvous / fixed / dropping /
sliding), <! >! <!! >!! close! alts! timeout put! take! buffer ctors, channel
transducers, and go-spawn, all def-var!'d into clojure.core.async; go/go-loop/
thread are macros (mark-macro!) expanding to go-spawn, mirroring src/jolt/
async.janet. Binding conveyance rides the thread-parameter binding stack from
pt.1. alts! polls with a 1ms backoff (no cross-channel wait-set yet) and is
take-only, matching the Janet impl.
(require '[clojure.core.async ...]) resolves it with no file load — the vars are
resident and require just registers the :as/:refer.
cli-test covers go/buffered-drain/nested-<!/alts!/transducer/timeout/binding-
conveyance (43/43). core.async isn't in the conformance corpus (feature-gated
:async/core-async), so coverage is the Chez cli-test plus the existing Janet
core-async-spec. Seed unchanged (no .clj touched). Prelude corpus 2534->2559,
zero-Janet 2569, 0 new divergences on either; Janet gate + JVM cert green.
jolt-byjr
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