type returns the JVM class (Clojure semantics) (#244)

(type x) was jolt's internal taxonomy keyword (:string/:set/:jolt/inst), which
breaks any library dispatching a multimethod on [(type a) (type b)] against
java/clojure.lang classes (e.g. clojure.tools.logging.test's matchers). Make the
PUBLIC clojure.core/type Clojure's (or (:type meta) (class x)).

The taxonomy keyword stays the core model: natives-meta.ss keeps jolt-type and
exposes it as __type-tag, which print-method/print-dup dispatch on (so #uuid/#regex/
records still print). The JVM mapping lives in the java host layer — host-class.ss
defines the public type next to (class …), and a jinst now reports java.util.Date
(was :jolt/inst). So the core emits the taxonomy and the java layer remaps it in one
place. unit.edn's type suite updated to the class names. make test green.

Co-authored-by: Yogthos <yogthos@gmail.com>

host/chez/java/host-class.ss

@@ -65,6 +65,19 @@
 
 (def-var! "clojure.core" "class" jolt-class)
 
+;; The PUBLIC clojure.core/type — Clojure's (or (:type meta) (class x)). This is the
+;; java host layer's job: the core taxonomy (natives-meta.ss jolt-type, kept under
+;; __type-tag for print-method) is JVM-free, and the JVM class mapping lives HERE,
+;; next to (class …). The inst/array/byte-buffer host files extend `class` (a
+;; class-arm or jolt-type fallthrough) and re-point `type` at this same fn, so the
+;; remap of every value — :jolt/inst -> java.util.Date etc. — happens in one place.
+(define ty-meta-key (keyword #f "type"))
+(define (jolt-type-pub x)
+  (let* ((m (jolt-meta x))
+         (override (if (jolt-nil? m) jolt-nil (jolt-get m ty-meta-key jolt-nil))))
+    (if (not (jolt-nil? override)) override (jolt-class x))))
+(def-var! "clojure.core" "type" jolt-type-pub)
+
 ;; bare class-name tokens -> canonical JVM class-name strings.
 (define class-token-alist
   '(("String" . "java.lang.String") ("Number" . "java.lang.Number")

host/chez/java/inst-time.ss

@@ -280,6 +280,10 @@
 
 (register-hash-arm! jinst? (lambda (x) (jolt-hash (jinst-ms x))))
 
+;; #inst is a java.util.Date — (class x) / (type x) report that, not the internal
+;; :jolt/inst tag (which print-method still dispatches on via __type-tag).
+(register-class-arm! jinst? (lambda (x) "java.util.Date"))
+
 ;; java.time.Instant is nano-precise: two Instants are = when their epoch-nanos
 ;; match (so an Instant and one shifted by a single nanosecond differ).
 (define (jt-instant-tag? x) (and (jhost? x) (string=? (jhost-tag x) "instant")))
@@ -303,7 +307,6 @@
 
 (define %it-type jolt-type)
 (set! jolt-type (lambda (x) (if (jinst? x) inst-type-kw (%it-type x))))
-(def-var! "clojure.core" "type" jolt-type)
 
 ;; instance? java.util.Date -> a jinst; java.time.Instant/LocalDateTime -> the
 ;; matching jhost tag. The instance? macro passes the class-name symbol.

host/chez/java/io.ss

@@ -319,7 +319,6 @@
 (define io-kw-file (keyword "jolt" "file"))
 (define %io-type jolt-type)
 (set! jolt-type (lambda (x) (if (jfile? x) io-kw-file (%io-type x))))
-(def-var! "clojure.core" "type" jolt-type)
 
 ;; (instance? java.io.File f): the instance? macro passes the class-name symbol;
 ;; match "File" / "java.io.File" (and any *.File) against a jfile.

host/chez/java/natives-array.ss

@@ -156,7 +156,6 @@
 ;; (jolt-type …) for arrays, so extending jolt-type covers both.
 (define %na-type jolt-type)
 (set! jolt-type (lambda (x) (if (jolt-array? x) (na-array-class-name x) (%na-type x))))
-(def-var! "clojure.core" "type" jolt-type)
 
 ;; instance? over an array class token ([I, [C, …). An array token reaches us as
 ;; a string ("[C", from (Class/forName "[C")) — the dispatcher leaves it a string