diff --git a/xenomorph/xenomorph/struct.rkt b/xenomorph/xenomorph/struct.rkt
index 56b5c528..9395521c 100644
--- a/xenomorph/xenomorph/struct.rkt
+++ b/xenomorph/xenomorph/struct.rkt
@@ -50,7 +50,7 @@ https://github.com/mbutterick/restructure/blob/master/src/Struct.coffee
     (super-new)
     (init-field [(@fields fields)])
 
-    (define/augment (xxdecode port parent [len 0])
+    (define/augride (xxdecode port parent [len 0])
       ;; xstruct-setup and xstruct-parse-fields are separate to cooperate with VersionedStruct
       (define decoded-hash
         (xstruct-parse-fields port (xstruct-setup port parent len) @fields))
@@ -61,7 +61,7 @@ https://github.com/mbutterick/restructure/blob/master/src/Struct.coffee
     (define/override (decode port parent)
       (dict->mutable-hash (xxdecode port parent)))
 
-    (define/augment (xxencode val port [parent-arg #f])
+    (define/augride (xxencode val port [parent-arg #f])
       ;; check keys first, since `size` also relies on keys being valid
       (unless (dict? val)
         (raise-result-error 'xstruct-encode "dict" val))
@@ -80,7 +80,7 @@ https://github.com/mbutterick/restructure/blob/master/src/Struct.coffee
       (for ([ptr (in-list (dict-ref parent 'pointers))])
         (send (dict-ref ptr 'type) xxencode (dict-ref ptr 'val) port (dict-ref ptr 'parent))))
     
-    (define/augment (xxsize [val #f] [parent-arg #f] [include-pointers #t])
+    (define/augride (xxsize [val #f] [parent-arg #f] [include-pointers #t])
       (define parent (mhasheq 'parent parent-arg
                               'val val
                               'pointerSize 0))
diff --git a/xenomorph/xenomorph/versioned-struct.rkt b/xenomorph/xenomorph/versioned-struct.rkt
index 9215e3c0..2667a36a 100644
--- a/xenomorph/xenomorph/versioned-struct.rkt
+++ b/xenomorph/xenomorph/versioned-struct.rkt
@@ -14,7 +14,12 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
   (class xstruct%
     (super-new)
     (init-field [(@type type)] [(@versions versions)])
-    (inherit-field [@fields fields])
+
+    (unless (for/or ([proc (list integer? procedure? xenomorphic-type? symbol?)])
+                    (proc @type))
+      (raise-argument-error '+xversioned-struct "integer, procedure, symbol, or xenomorphic" @type))
+    (unless (and (dict? @versions) (andmap (λ (v) (or (dict? v) (xstruct? v))) (dict-values @versions)))
+      (raise-argument-error '+xversioned-struct "dict of dicts or structish" @versions))
 
     (define version-getter (cond
                              [(procedure? @type) @type]
@@ -30,18 +35,17 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
         (raise-argument-error 'xversioned-struct-encode "valid version key" version))
       (if (xstruct? field-object) (get-field fields field-object) field-object))
 
-    (define/augment (xxdecode port parent [length 0])
+    (define/override (xxdecode port parent [length 0])
       (define res (xstruct-setup port parent length))
       (dict-set! res 'version
                  (cond
                    [(integer? @type) @type]
-                   #;[forced-version] ; for testing purposes: pass an explicit version
                    [(or (symbol? @type) (procedure? @type))
                     (unless parent
                       (raise-argument-error 'xversioned-struct-decode "valid parent" parent))
                     (version-getter parent)]
                    [else (send @type xxdecode port)]))
-
+      
       (when (dict-ref @versions 'header #f)
         (xstruct-parse-fields port res (dict-ref @versions 'header)))
     
@@ -54,7 +58,7 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
         [else (xstruct-parse-fields port res fields)
               res]))
 
-    (define/augment (xxencode encode-me port [parent-arg #f])
+    (define/override (xxencode encode-me port [parent-arg #f])
       (unless (dict? encode-me)
         (raise-argument-error 'xversioned-struct-encode "dict" encode-me))
       (define parent (mhash 'pointers null
@@ -68,17 +72,17 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
       (define maybe-header-dict (dict-ref @versions 'header #f))
       (when maybe-header-dict
         (for ([(key type) (in-dict maybe-header-dict)])
-          (send type xxencode (dict-ref encode-me key) port parent)))
+             (send type xxencode (dict-ref encode-me key) port parent)))
 
       (define fields (extract-fields-dict encode-me))
       (unless (andmap (λ (key) (member key (dict-keys encode-me))) (dict-keys fields))
         (raise-argument-error 'xversioned-struct-encode (format "hash that contains superset of xversioned-struct keys: ~a" (dict-keys fields)) (hash-keys encode-me)))
       (for ([(key type) (in-dict fields)])
-        (send type xxencode (dict-ref encode-me key) port parent))
+           (send type xxencode (dict-ref encode-me key) port parent))
       (for ([ptr (in-list (dict-ref parent 'pointers))])
-        (send (dict-ref ptr 'type) xxencode (dict-ref ptr 'val) port (dict-ref ptr 'parent))))
+           (send (dict-ref ptr 'type) xxencode (dict-ref ptr 'val) port (dict-ref ptr 'parent))))
     
-    (define/augment (xxsize [val #f] [parent-arg #f] [include-pointers #t])
+    (define/override (xxsize [val #f] [parent-arg #f] [include-pointers #t])
       (unless val
         (raise-argument-error 'xversioned-struct-size "value" val))
       (define parent (mhash 'parent parent-arg 'val val 'pointerSize 0))
@@ -89,20 +93,15 @@ https://github.com/mbutterick/restructure/blob/master/src/VersionedStruct.coffee
               (send @type xxsize (dict-ref val 'version) parent))))
       (define header-size
         (for/sum ([(key type) (in-dict (or (dict-ref @versions 'header #f) null))])
-          (send type xxsize (and val (dict-ref val key)) parent)))
+                 (send type xxsize (and val (dict-ref val key)) parent)))
       (define fields-size
         (for/sum ([(key type) (in-dict (extract-fields-dict val))])
-          (send type xxsize (and val (dict-ref val key)) parent)))
+                 (send type xxsize (and val (dict-ref val key)) parent)))
       (define pointer-size (if include-pointers (dict-ref parent 'pointerSize) 0))
       (+ version-size header-size fields-size pointer-size))))
 
 (define (xversioned-struct? x) (is-a? x xversioned-struct%))
 
 (define (+xversioned-struct #:subclass [class xversioned-struct%] type [versions (dictify)])
-  (unless (for/or ([proc (list integer? procedure? xenomorphic-type? symbol?)])
-            (proc type))
-    (raise-argument-error '+xversioned-struct "integer, procedure, symbol, or xenomorphic" type))
-  (unless (and (dict? versions) (andmap (λ (v) (or (dict? v) (xstruct? v))) (dict-values versions)))
-    (raise-argument-error '+xversioned-struct "dict of dicts or structish" versions))
-  (new class [type type] [versions versions]))
+  (new class [type type] [versions versions][fields #f]))