HS: repeat property for-loops + where (+3 tests)

Re-applied from worktree-agent-a7c6dca2be5bbada0 (commit c4241d57)
onto HEAD that already has clusters 30, 26, 27 runtime changes —
straight cherry-pick conflicted on the cluster-30 log-all block
and cluster-27 intersection helper, so the logical diff was
replayed surgically.

Parser (parse-atom object-literal):
- obj-collect now `append`s pairs in source order instead of
  `cons`'ing, so `{foo:1, bar:2, baz:3}` reaches hs-make-object
  as `((foo 1) (bar 2) (baz 3))`.

Compiler (emit-for, array-index emission):
- emit-for detects `for x in COLL where COND` (parser wraps COLL
  as `(coll-where INNER COND)`) and rewrites the filter lambda
  to bind the for-loop variable name rather than the default
  `it`, so `where x.val > 10` sees the right binding. Also
  unwraps `coll-where` so filter targets the real inner coll.
- emit-for now wraps a symbol collection with `cek-try` (not the
  broken `hs-safe-call`, which has an uninitialised CEK call-ref
  in the WASM build) so `for prop in x` after `set x to {…}`
  iterates x's keys instead of nil.
- array-index emits `(hs-index obj key)` instead of
  `(nth obj key)`, which only worked on lists.

Runtime:
- New polymorphic `hs-index` dispatches to get / nth / host-get
  based on target type (dict / list / string / otherwise).
- `hs-put-at!` default branch now detects DOM elements via
  `hs-element?` and delegates to `hs-put!`, so `put X at end of
  elt` on a DOM node appends innerHTML instead of crashing.
- `hs-make-object` tracks insertion order in a hidden `_order`
  list; `hs-for-each` and `hs-coerce` (Keys / Entries / Map
  branches) prefer `_order` when present, filtering the marker
  out of output.

Suite hs-upstream-repeat: 25/30 → 28/30 (+3).
Smoke 0-195 unchanged at 165/195.

lib/hyperscript/compiler.sx

@@ -337,14 +337,33 @@
         (ast)
         (let
           ((var-name (nth ast 1))
-            (raw-coll (hs-to-sx (nth ast 2)))
-            (collection
+            (raw-coll-ast (nth ast 2))
+            (where-cond
+              (if
+                (and
+                  (list? raw-coll-ast)
+                  (= (first raw-coll-ast) (quote coll-where)))
+                (hs-to-sx (nth raw-coll-ast 2))
+                nil))
+            (inner-coll-ast
+              (if where-cond (nth raw-coll-ast 1) raw-coll-ast))
+            (raw-coll (hs-to-sx inner-coll-ast))
+            (safe-coll
               (if
                 (symbol? raw-coll)
                 (list
-                  (quote hs-safe-call)
-                  (list (quote fn) (list) raw-coll))
+                  (quote cek-try)
+                  (list (quote fn) (list) raw-coll)
+                  (list (quote fn) (list (quote _e)) nil))
                 raw-coll))
+            (collection
+              (if
+                where-cond
+                (list
+                  (quote filter)
+                  (list (quote fn) (list (make-symbol var-name)) where-cond)
+                  safe-coll)
+                safe-coll))
             (body (hs-to-sx (nth ast 3))))
           (if
             (and (> (len ast) 4) (= (nth ast 4) :index))
@@ -839,7 +858,7 @@
                 (list (quote hs-beep) (hs-to-sx (nth ast 1))))
               ((= head (quote array-index))
                 (list
-                  (quote nth)
+                  (quote hs-index)
                   (hs-to-sx (nth ast 1))
                   (hs-to-sx (nth ast 2))))
               ((= head (quote array-slice))

lib/hyperscript/parser.sx

@@ -244,7 +244,8 @@
                             ((value (cond ((= (tp-type) "local") (let ((v (tp-val))) (do (adv!) (cond ((= v "true") true) ((= v "false") false) ((= v "null") nil) (true (list (quote ref) v)))))) ((= (tp-type) "colon") (do (adv!) (parse-expr))) (true (parse-expr)))))
                             (do
                               (when (= (tp-type) "comma") (adv!))
-                              (obj-collect (cons (list key value) acc))))))))
+                              (obj-collect
+                                (append acc (list (list key value))))))))))
                   (list (quote object-literal) (obj-collect (list)))))
               ((and (= typ "op") (= val "\\"))
                 (do

lib/hyperscript/runtime.sx

@@ -387,6 +387,21 @@
 
 ;; Fetch a URL, parse response according to format.
 ;; (hs-fetch url format) — format is "json" | "text" | "html"
+(define
+  hs-index
+  (fn
+    (obj key)
+    (cond
+      ((nil? obj) nil)
+      ((dict? obj) (get obj key))
+      ((list? obj) (nth obj key))
+      ((string? obj) (nth obj key))
+      (true (host-get obj key)))))
+
+;; ── Type coercion ───────────────────────────────────────────────
+
+;; Coerce a value to a type by name.
+;; (hs-coerce value type-name) — type-name is "Int", "Float", "String", etc.
 (define
   hs-put-at!
   (fn
@@ -398,17 +413,20 @@
           (= pos "start")
           (cons value target)
           (append target (list value))))
+      (true
+        (cond
+          ((hs-element? target) (do (hs-put! value pos target) target))
           (true
             (do
               (cond
                 ((= pos "end") (host-call target "push" value))
                 ((= pos "start") (host-call target "unshift" value)))
-          target)))))
+              target)))))))
 
-;; ── Type coercion ───────────────────────────────────────────────
+;; ── Object creation ─────────────────────────────────────────────
 
-;; Coerce a value to a type by name.
-;; (hs-coerce value type-name) — type-name is "Int", "Float", "String", etc.
+;; Make a new object of a given type.
+;; (hs-make type-name) — creates empty object/collection
 (define
   hs-dict-without
   (fn
@@ -429,27 +447,27 @@
           (host-call (host-global "Reflect") "deleteProperty" out key)
           out)))))
 
-;; ── Object creation ─────────────────────────────────────────────
+;; ── Behavior installation ───────────────────────────────────────
 
-;; Make a new object of a given type.
-;; (hs-make type-name) — creates empty object/collection
+;; Install a behavior on an element.
+;; A behavior is a function that takes (me ...params) and sets up features.
+;; (hs-install behavior-fn me ...args)
 (define
   hs-set-on!
   (fn
     (props target)
     (for-each (fn (k) (host-set! target k (get props k))) (keys props))))
 
-;; ── Behavior installation ───────────────────────────────────────
-
-;; Install a behavior on an element.
-;; A behavior is a function that takes (me ...params) and sets up features.
-;; (hs-install behavior-fn me ...args)
-(define hs-navigate! (fn (url) (perform (list (quote io-navigate) url))))
-
 ;; ── Measurement ─────────────────────────────────────────────────
 
 ;; Measure an element's bounding rect, store as local variables.
 ;; Returns a dict with x, y, width, height, top, left, right, bottom.
+(define hs-navigate! (fn (url) (perform (list (quote io-navigate) url))))
+
+;; Return the current text selection as a string.  In the browser this is
+;; `window.getSelection().toString()`.  In the mock test runner, a test
+;; setup stashes the desired selection text at `window.__test_selection`
+;; and the fallback path returns that so tests can assert on the result.
 (define
   hs-scroll!
   (fn
@@ -462,10 +480,11 @@
           ((= position "bottom") (dict :block "end"))
           (true (dict :block "start")))))))
 
-;; Return the current text selection as a string.  In the browser this is
-;; `window.getSelection().toString()`.  In the mock test runner, a test
-;; setup stashes the desired selection text at `window.__test_selection`
-;; and the fallback path returns that so tests can assert on the result.
+
+;; ── Transition ──────────────────────────────────────────────────
+
+;; Transition a CSS property to a value, optionally with duration.
+;; (hs-transition target prop value duration)
 (define
   hs-halt!
   (fn
@@ -486,11 +505,6 @@
               (host-call ev "stopPropagation")))))
       (when (not (= mode "the-event")) (raise (list "hs-return" nil))))))
 
-
-;; ── Transition ──────────────────────────────────────────────────
-
-;; Transition a CSS property to a value, optionally with duration.
-;; (hs-transition target prop value duration)
 (define hs-select! (fn (target) (host-call target "select" (list))))
 
 (define
@@ -619,6 +633,10 @@
   hs-query-first
   (fn (sel) (host-call (host-global "document") "querySelector" sel)))
 
+
+
+
+
 (define
   hs-query-last
   (fn
@@ -627,12 +645,9 @@
       ((all (dom-query-all (dom-body) sel)))
       (if (> (len all) 0) (nth all (- (len all) 1)) nil))))
 
-
-
-
-
 (define hs-first (fn (scope sel) (dom-query-all scope sel)))
-
+;; ── Sandbox/test runtime additions ──────────────────────────────
+;; Property access — dot notation and .length
 (define
   hs-last
   (fn
@@ -640,8 +655,7 @@
     (let
       ((all (dom-query-all scope sel)))
       (if (> (len all) 0) (nth all (- (len all) 1)) nil))))
-;; ── Sandbox/test runtime additions ──────────────────────────────
-;; Property access — dot notation and .length
+;; DOM query stub — sandbox returns empty list
 (define
   hs-repeat-times
   (fn
@@ -659,7 +673,7 @@
               ((= signal "hs-continue") (do-repeat (+ i 1)))
               (true (do-repeat (+ i 1))))))))
     (do-repeat 0)))
-;; DOM query stub — sandbox returns empty list
+;; Method dispatch — obj.method(args)
 (define
   hs-repeat-forever
   (fn
@@ -675,7 +689,9 @@
             ((= signal "hs-continue") (do-forever))
             (true (do-forever))))))
     (do-forever)))
-;; Method dispatch — obj.method(args)
+
+;; ── 0.9.90 features ─────────────────────────────────────────────
+;; beep! — debug logging, returns value unchanged
 (define
   hs-repeat-while
   (fn
@@ -688,9 +704,7 @@
           ((= signal "hs-break") nil)
           ((= signal "hs-continue") (hs-repeat-while cond-fn thunk))
           (true (hs-repeat-while cond-fn thunk)))))))
-
-;; ── 0.9.90 features ─────────────────────────────────────────────
-;; beep! — debug logging, returns value unchanged
+;; Property-based is — check obj.key truthiness
 (define
   hs-repeat-until
   (fn
@@ -702,13 +716,13 @@
         ((= signal "hs-continue")
           (if (cond-fn) nil (hs-repeat-until cond-fn thunk)))
         (true (if (cond-fn) nil (hs-repeat-until cond-fn thunk)))))))
-;; Property-based is — check obj.key truthiness
+;; Array slicing (inclusive both ends)
 (define
   hs-for-each
   (fn
     (fn-body collection)
     (let
-      ((items (cond ((list? collection) collection) ((dict? collection) (keys collection)) ((nil? collection) (list)) (true (list)))))
+      ((items (cond ((list? collection) collection) ((dict? collection) (if (dict-has? collection "_order") (get collection "_order") (filter (fn (k) (not (= k "_order"))) (keys collection)))) ((nil? collection) (list)) (true (list)))))
       (define
         do-loop
         (fn
@@ -722,7 +736,7 @@
                 ((= signal "hs-continue") (do-loop (rest remaining)))
                 (true (do-loop (rest remaining))))))))
       (do-loop items))))
-;; Array slicing (inclusive both ends)
+;; Collection: sorted by
 (begin
   (define
     hs-append
@@ -750,7 +764,7 @@
         ((hs-element? target)
           (dom-insert-adjacent-html target "beforeend" (str value)))
         (true nil)))))
-;; Collection: sorted by
+;; Collection: sorted by descending
 (define
   hs-sender
   (fn
@@ -758,7 +772,7 @@
     (let
       ((detail (host-get event "detail")))
       (if detail (host-get detail "sender") nil))))
-;; Collection: sorted by descending
+;; Collection: split by
 (define
   hs-host-to-sx
   (fn
@@ -812,7 +826,7 @@
                           (dict-set! out k (hs-host-to-sx (host-get v k))))
                         (host-call (host-global "Object") "keys" v))
                       out)))))))))))
-;; Collection: split by
+;; Collection: joined by
 (define
   hs-fetch
   (fn
@@ -822,7 +836,7 @@
       (let
         ((raw (perform (list "io-fetch" url fmt))))
         (cond ((= fmt "json") (hs-host-to-sx raw)) (true raw))))))
-;; Collection: joined by
+
 (define
   hs-json-escape
   (fn
@@ -958,11 +972,17 @@
       ((= type-name "Selector") (str value))
       ((= type-name "Fragment") value)
       ((= type-name "Values") (hs-as-values value))
-      ((= type-name "Keys") (if (dict? value) (sort (keys value)) value))
+      ((= type-name "Keys")
+        (if
+          (dict? value)
+          (sort (filter (fn (k) (not (= k "_order"))) (keys value)))
+          value))
       ((= type-name "Entries")
         (if
           (dict? value)
-          (map (fn (k) (list k (get value k))) (keys value))
+          (let
+            ((ks (if (dict-has? value "_order") (get value "_order") (filter (fn (k) (not (= k "_order"))) (keys value)))))
+            (map (fn (k) (list k (get value k))) ks))
           value))
       ((= type-name "Reversed") (if (list? value) (reverse value) value))
       ((= type-name "Unique")
@@ -998,7 +1018,9 @@
       ((= type-name "Map")
         (if
           (dict? value)
-          (map (fn (k) (list k (get value k))) (keys value))
+          (let
+            ((ks (if (dict-has? value "_order") (get value "_order") (filter (fn (k) (not (= k "_order"))) (keys value)))))
+            (map (fn (k) (list k (get value k))) ks))
           value))
       (true value))))
 
@@ -2012,11 +2034,20 @@
   (fn
     (pairs)
     (let
-      ((d {}))
+      ((d {}) (order (list)))
       (do
         (for-each
-          (fn (pair) (dict-set! d (first pair) (nth pair 1)))
+          (fn
+            (pair)
+            (let
+              ((k (first pair)))
+              (do
+                (when
+                  (not (dict-has? d k))
+                  (set! order (append order (list k))))
+                (dict-set! d k (nth pair 1)))))
           pairs)
+        (when (not (empty? order)) (dict-set! d "_order" order))
         d))))
 
 (define

shared/static/wasm/sx/hs-compiler.sx

@@ -337,14 +337,33 @@
         (ast)
         (let
           ((var-name (nth ast 1))
-            (raw-coll (hs-to-sx (nth ast 2)))
-            (collection
+            (raw-coll-ast (nth ast 2))
+            (where-cond
+              (if
+                (and
+                  (list? raw-coll-ast)
+                  (= (first raw-coll-ast) (quote coll-where)))
+                (hs-to-sx (nth raw-coll-ast 2))
+                nil))
+            (inner-coll-ast
+              (if where-cond (nth raw-coll-ast 1) raw-coll-ast))
+            (raw-coll (hs-to-sx inner-coll-ast))
+            (safe-coll
               (if
                 (symbol? raw-coll)
                 (list
-                  (quote hs-safe-call)
-                  (list (quote fn) (list) raw-coll))
+                  (quote cek-try)
+                  (list (quote fn) (list) raw-coll)
+                  (list (quote fn) (list (quote _e)) nil))
                 raw-coll))
+            (collection
+              (if
+                where-cond
+                (list
+                  (quote filter)
+                  (list (quote fn) (list (make-symbol var-name)) where-cond)
+                  safe-coll)
+                safe-coll))
             (body (hs-to-sx (nth ast 3))))
           (if
             (and (> (len ast) 4) (= (nth ast 4) :index))
@@ -839,7 +858,7 @@
                 (list (quote hs-beep) (hs-to-sx (nth ast 1))))
               ((= head (quote array-index))
                 (list
-                  (quote nth)
+                  (quote hs-index)
                   (hs-to-sx (nth ast 1))
                   (hs-to-sx (nth ast 2))))
               ((= head (quote array-slice))

shared/static/wasm/sx/hs-parser.sx

@@ -244,7 +244,8 @@
                             ((value (cond ((= (tp-type) "local") (let ((v (tp-val))) (do (adv!) (cond ((= v "true") true) ((= v "false") false) ((= v "null") nil) (true (list (quote ref) v)))))) ((= (tp-type) "colon") (do (adv!) (parse-expr))) (true (parse-expr)))))
                             (do
                               (when (= (tp-type) "comma") (adv!))
-                              (obj-collect (cons (list key value) acc))))))))
+                              (obj-collect
+                                (append acc (list (list key value))))))))))
                   (list (quote object-literal) (obj-collect (list)))))
               ((and (= typ "op") (= val "\\"))
                 (do

shared/static/wasm/sx/hs-runtime.sx

@@ -387,6 +387,21 @@
 
 ;; Fetch a URL, parse response according to format.
 ;; (hs-fetch url format) — format is "json" | "text" | "html"
+(define
+  hs-index
+  (fn
+    (obj key)
+    (cond
+      ((nil? obj) nil)
+      ((dict? obj) (get obj key))
+      ((list? obj) (nth obj key))
+      ((string? obj) (nth obj key))
+      (true (host-get obj key)))))
+
+;; ── Type coercion ───────────────────────────────────────────────
+
+;; Coerce a value to a type by name.
+;; (hs-coerce value type-name) — type-name is "Int", "Float", "String", etc.
 (define
   hs-put-at!
   (fn
@@ -398,17 +413,20 @@
           (= pos "start")
           (cons value target)
           (append target (list value))))
+      (true
+        (cond
+          ((hs-element? target) (do (hs-put! value pos target) target))
           (true
             (do
               (cond
                 ((= pos "end") (host-call target "push" value))
                 ((= pos "start") (host-call target "unshift" value)))
-          target)))))
+              target)))))))
 
-;; ── Type coercion ───────────────────────────────────────────────
+;; ── Object creation ─────────────────────────────────────────────
 
-;; Coerce a value to a type by name.
-;; (hs-coerce value type-name) — type-name is "Int", "Float", "String", etc.
+;; Make a new object of a given type.
+;; (hs-make type-name) — creates empty object/collection
 (define
   hs-dict-without
   (fn
@@ -429,27 +447,27 @@
           (host-call (host-global "Reflect") "deleteProperty" out key)
           out)))))
 
-;; ── Object creation ─────────────────────────────────────────────
+;; ── Behavior installation ───────────────────────────────────────
 
-;; Make a new object of a given type.
-;; (hs-make type-name) — creates empty object/collection
+;; Install a behavior on an element.
+;; A behavior is a function that takes (me ...params) and sets up features.
+;; (hs-install behavior-fn me ...args)
 (define
   hs-set-on!
   (fn
     (props target)
     (for-each (fn (k) (host-set! target k (get props k))) (keys props))))
 
-;; ── Behavior installation ───────────────────────────────────────
-
-;; Install a behavior on an element.
-;; A behavior is a function that takes (me ...params) and sets up features.
-;; (hs-install behavior-fn me ...args)
-(define hs-navigate! (fn (url) (perform (list (quote io-navigate) url))))
-
 ;; ── Measurement ─────────────────────────────────────────────────
 
 ;; Measure an element's bounding rect, store as local variables.
 ;; Returns a dict with x, y, width, height, top, left, right, bottom.
+(define hs-navigate! (fn (url) (perform (list (quote io-navigate) url))))
+
+;; Return the current text selection as a string.  In the browser this is
+;; `window.getSelection().toString()`.  In the mock test runner, a test
+;; setup stashes the desired selection text at `window.__test_selection`
+;; and the fallback path returns that so tests can assert on the result.
 (define
   hs-scroll!
   (fn
@@ -462,10 +480,11 @@
           ((= position "bottom") (dict :block "end"))
           (true (dict :block "start")))))))
 
-;; Return the current text selection as a string.  In the browser this is
-;; `window.getSelection().toString()`.  In the mock test runner, a test
-;; setup stashes the desired selection text at `window.__test_selection`
-;; and the fallback path returns that so tests can assert on the result.
+
+;; ── Transition ──────────────────────────────────────────────────
+
+;; Transition a CSS property to a value, optionally with duration.
+;; (hs-transition target prop value duration)
 (define
   hs-halt!
   (fn
@@ -486,11 +505,6 @@
               (host-call ev "stopPropagation")))))
       (when (not (= mode "the-event")) (raise (list "hs-return" nil))))))
 
-
-;; ── Transition ──────────────────────────────────────────────────
-
-;; Transition a CSS property to a value, optionally with duration.
-;; (hs-transition target prop value duration)
 (define hs-select! (fn (target) (host-call target "select" (list))))
 
 (define
@@ -619,6 +633,10 @@
   hs-query-first
   (fn (sel) (host-call (host-global "document") "querySelector" sel)))
 
+
+
+
+
 (define
   hs-query-last
   (fn
@@ -627,12 +645,9 @@
       ((all (dom-query-all (dom-body) sel)))
       (if (> (len all) 0) (nth all (- (len all) 1)) nil))))
 
-
-
-
-
 (define hs-first (fn (scope sel) (dom-query-all scope sel)))
-
+;; ── Sandbox/test runtime additions ──────────────────────────────
+;; Property access — dot notation and .length
 (define
   hs-last
   (fn
@@ -640,8 +655,7 @@
     (let
       ((all (dom-query-all scope sel)))
       (if (> (len all) 0) (nth all (- (len all) 1)) nil))))
-;; ── Sandbox/test runtime additions ──────────────────────────────
-;; Property access — dot notation and .length
+;; DOM query stub — sandbox returns empty list
 (define
   hs-repeat-times
   (fn
@@ -659,7 +673,7 @@
               ((= signal "hs-continue") (do-repeat (+ i 1)))
               (true (do-repeat (+ i 1))))))))
     (do-repeat 0)))
-;; DOM query stub — sandbox returns empty list
+;; Method dispatch — obj.method(args)
 (define
   hs-repeat-forever
   (fn
@@ -675,7 +689,9 @@
             ((= signal "hs-continue") (do-forever))
             (true (do-forever))))))
     (do-forever)))
-;; Method dispatch — obj.method(args)
+
+;; ── 0.9.90 features ─────────────────────────────────────────────
+;; beep! — debug logging, returns value unchanged
 (define
   hs-repeat-while
   (fn
@@ -688,9 +704,7 @@
           ((= signal "hs-break") nil)
           ((= signal "hs-continue") (hs-repeat-while cond-fn thunk))
           (true (hs-repeat-while cond-fn thunk)))))))
-
-;; ── 0.9.90 features ─────────────────────────────────────────────
-;; beep! — debug logging, returns value unchanged
+;; Property-based is — check obj.key truthiness
 (define
   hs-repeat-until
   (fn
@@ -702,13 +716,13 @@
         ((= signal "hs-continue")
           (if (cond-fn) nil (hs-repeat-until cond-fn thunk)))
         (true (if (cond-fn) nil (hs-repeat-until cond-fn thunk)))))))
-;; Property-based is — check obj.key truthiness
+;; Array slicing (inclusive both ends)
 (define
   hs-for-each
   (fn
     (fn-body collection)
     (let
-      ((items (cond ((list? collection) collection) ((dict? collection) (keys collection)) ((nil? collection) (list)) (true (list)))))
+      ((items (cond ((list? collection) collection) ((dict? collection) (if (dict-has? collection "_order") (get collection "_order") (filter (fn (k) (not (= k "_order"))) (keys collection)))) ((nil? collection) (list)) (true (list)))))
       (define
         do-loop
         (fn
@@ -722,7 +736,7 @@
                 ((= signal "hs-continue") (do-loop (rest remaining)))
                 (true (do-loop (rest remaining))))))))
       (do-loop items))))
-;; Array slicing (inclusive both ends)
+;; Collection: sorted by
 (begin
   (define
     hs-append
@@ -750,7 +764,7 @@
         ((hs-element? target)
           (dom-insert-adjacent-html target "beforeend" (str value)))
         (true nil)))))
-;; Collection: sorted by
+;; Collection: sorted by descending
 (define
   hs-sender
   (fn
@@ -758,7 +772,7 @@
     (let
       ((detail (host-get event "detail")))
       (if detail (host-get detail "sender") nil))))
-;; Collection: sorted by descending
+;; Collection: split by
 (define
   hs-host-to-sx
   (fn
@@ -812,7 +826,7 @@
                           (dict-set! out k (hs-host-to-sx (host-get v k))))
                         (host-call (host-global "Object") "keys" v))
                       out)))))))))))
-;; Collection: split by
+;; Collection: joined by
 (define
   hs-fetch
   (fn
@@ -822,7 +836,7 @@
       (let
         ((raw (perform (list "io-fetch" url fmt))))
         (cond ((= fmt "json") (hs-host-to-sx raw)) (true raw))))))
-;; Collection: joined by
+
 (define
   hs-json-escape
   (fn
@@ -958,11 +972,17 @@
       ((= type-name "Selector") (str value))
       ((= type-name "Fragment") value)
       ((= type-name "Values") (hs-as-values value))
-      ((= type-name "Keys") (if (dict? value) (sort (keys value)) value))
+      ((= type-name "Keys")
+        (if
+          (dict? value)
+          (sort (filter (fn (k) (not (= k "_order"))) (keys value)))
+          value))
       ((= type-name "Entries")
         (if
           (dict? value)
-          (map (fn (k) (list k (get value k))) (keys value))
+          (let
+            ((ks (if (dict-has? value "_order") (get value "_order") (filter (fn (k) (not (= k "_order"))) (keys value)))))
+            (map (fn (k) (list k (get value k))) ks))
           value))
       ((= type-name "Reversed") (if (list? value) (reverse value) value))
       ((= type-name "Unique")
@@ -998,7 +1018,9 @@
       ((= type-name "Map")
         (if
           (dict? value)
-          (map (fn (k) (list k (get value k))) (keys value))
+          (let
+            ((ks (if (dict-has? value "_order") (get value "_order") (filter (fn (k) (not (= k "_order"))) (keys value)))))
+            (map (fn (k) (list k (get value k))) ks))
           value))
       (true value))))
 
@@ -2012,11 +2034,20 @@
   (fn
     (pairs)
     (let
-      ((d {}))
+      ((d {}) (order (list)))
       (do
         (for-each
-          (fn (pair) (dict-set! d (first pair) (nth pair 1)))
+          (fn
+            (pair)
+            (let
+              ((k (first pair)))
+              (do
+                (when
+                  (not (dict-has? d k))
+                  (set! order (append order (list k))))
+                (dict-set! d k (nth pair 1)))))
           pairs)
+        (when (not (empty? order)) (dict-set! d "_order" order))
         d))))
 
 (define