jolt was all-flonum (one :number type, inherited from Janet whose only number
type is a double). The Chez runtime has a full numeric tower, so the zero-Janet
path now carries it = JVM Clojure semantics:
(/ 1 2) => 1/2 (exact Ratio, was 0.5)
(integer? 3) => true (integer? 3.0) => false (float? 3.0) => true
(ratio? (/ 1 2)) => true (= 3 3.0) => false (== 3 3.0) => true
(+ 1 2) => 3 (exact) (/ 1.0 2) => 0.5 (double)
jolt= was already exactness-aware (values.ss) and == is value-equality, so
=/== match the JVM split. The reader preserves exactness (integer literals exact,
a/b ratios exact rationals, decimals/exponents flonums); backend_scheme emit-const
renders exact ints/ratios and flonums faithfully; the value-position arithmetic,
count, int, compare, bit ops, parseLong, string .length/.indexOf, range,
timestamps, and array bytes return exact integers (= JVM int/long) instead of
coercing to flonum. double/parseDouble/clojure.math floor|ceil|signum stay double.
Only the zero-Janet path carries the tower (the Janet reader loses exactness into
a double before emit). The prelude/all-flonum path is unaffected for compiled code;
the runtime reader is shared, so a couple of all-flonum reader assertions become
value (==) assertions. ~16 numeric corpus cases now give the JVM tower value vs the
Janet-era :expected and are allowlisted as tower divergences (Chez == reference
JVM) pending the corpus flip to JVM (jolt-ecz0). No BigDecimal type (1M).
Re-minted. zero-janet 2682 (floor 2698->2682, the reclassified tower cases), 0 new
divergences; fixpoint 10/10, bootstrap 6/6, spine 35/35, cli 49/49; Janet gate 155
files 0 failed.
Chez-side recursive-descent Clojure reader (host/chez/reader.ss) producing the
same jolt forms the Janet reader yields, behind the read-string / __parse-next /
__read-tagged seams the seed registers in eval_runtime.janet. That lights up the
whole *in* read family — read, read+string, with-in-str (read) — plus read-string
and read-string metadata, none of which needed an analyzer change (read-string is
a clojure.core seam, jolt-nil on the prelude until now).
Reader output is pinned to the Janet reader's shapes: numbers coerce to flonum
(the all-double model emit-const uses, else a read int isn't = a source int),
sets read as the {:jolt/type :jolt/set :value [...]} FORM, #tag/#inst/#uuid/#regex
as tagged forms (no data reader applied — read-string never evaluates), ^meta on
a symbol, and the ' ` ~ ~@ @ reader macros. clojure.edn is added to the prelude
tier; its edn->value builds the real set/tagged values and __read-tagged reuses
the inc X #inst/#uuid constructors. The reader-arity edn/read stays a lazy gap
(drain-reader is Janet-coupled) — read-string is the live path.
eval / load-string / runtime defmacro are still out: they need the compiler at
runtime, which is Phase 3 (self-host). Chez-only change, no Janet gate.
Parity 2238 -> 2259, 0 new divergences. _reader 47/47; all chez unit tests green;
emit-test 331/331.
