diff --git a/include/xo/object2/DArray.hpp b/include/xo/object2/DArray.hpp
index 332d126..99d1b3d 100644
--- a/include/xo/object2/DArray.hpp
+++ b/include/xo/object2/DArray.hpp
@@ -148,7 +148,7 @@ namespace xo {
             /** shallow memory consumption. Excludes child objects **/
             AAllocator::size_type shallow_size() const noexcept;
             /** return shallow copy of this array, using memory from @p mm **/
-            DArray * shallow_copy(obj<AAllocator> mm) const noexcept;
+            DArray * shallow_move(obj<AAllocator> mm) const noexcept;
             /** forward elements to @p gc to-space; replace originals with forarding pointers **/
             AAllocator::size_type forward_children(obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/DBoolean.hpp b/include/xo/object2/DBoolean.hpp
index 72f5fad..34ffda1 100644
--- a/include/xo/object2/DBoolean.hpp
+++ b/include/xo/object2/DBoolean.hpp
@@ -38,7 +38,7 @@ namespace xo {
             // GCObject facet
 
             std::size_t shallow_size() const noexcept;
-            DBoolean * shallow_copy(obj<AAllocator> mm) const noexcept;
+            DBoolean * shallow_move(obj<AAllocator> mm) const noexcept;
             std::size_t forward_children(obj<ACollector> gc) noexcept;
 
         private:
diff --git a/include/xo/object2/DDictionary.hpp b/include/xo/object2/DDictionary.hpp
index 1c77d2c..5e6ecae 100644
--- a/include/xo/object2/DDictionary.hpp
+++ b/include/xo/object2/DDictionary.hpp
@@ -203,7 +203,7 @@ namespace xo {
             /** shallow memory consumption. Excludes child objects **/
             AAllocator::size_type shallow_size() const noexcept;
             /** return shallow copy of this array, using memory from @p mm **/
-            DDictionary * shallow_copy(obj<AAllocator> mm) noexcept;
+            DDictionary * shallow_move(obj<AAllocator> mm) noexcept;
             /** forward elements to @p gc to-space; replace originals with forarding pointers **/
             AAllocator::size_type forward_children(obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/DFloat.hpp b/include/xo/object2/DFloat.hpp
index 4e4be86..b7d56e9 100644
--- a/include/xo/object2/DFloat.hpp
+++ b/include/xo/object2/DFloat.hpp
@@ -35,7 +35,7 @@ namespace xo {
 
             // GCObject facet
             std::size_t shallow_size() const noexcept;
-            DFloat * shallow_copy(obj<AAllocator> mm) const noexcept;
+            DFloat * shallow_move(obj<AAllocator> mm) const noexcept;
             std::size_t forward_children(obj<ACollector> gc) noexcept;
 
         private:
diff --git a/include/xo/object2/DInteger.hpp b/include/xo/object2/DInteger.hpp
index a67e18d..6a6194b 100644
--- a/include/xo/object2/DInteger.hpp
+++ b/include/xo/object2/DInteger.hpp
@@ -40,7 +40,7 @@ namespace xo {
             // GCObject facet
 
             std::size_t shallow_size() const noexcept;
-            DInteger * shallow_copy(obj<AAllocator> mm) const noexcept;
+            DInteger * shallow_move(obj<AAllocator> mm) const noexcept;
             std::size_t forward_children(obj<ACollector> gc) noexcept;
 
         private:
diff --git a/include/xo/object2/DList.hpp b/include/xo/object2/DList.hpp
index f6ea9d8..8fff47d 100644
--- a/include/xo/object2/DList.hpp
+++ b/include/xo/object2/DList.hpp
@@ -70,7 +70,7 @@ namespace xo {
             /** @defgroup xo-scm-list-gcobject-facet gcobject facet **/
             ///@{
             size_type shallow_size() const noexcept;
-            DList * shallow_copy(obj<AAllocator> mm) noexcept;
+            DList * shallow_move(obj<AAllocator> mm) noexcept;
             size_type forward_children(obj<ACollector> gc) noexcept;
             ///@}
 
diff --git a/include/xo/object2/DRuntimeError.hpp b/include/xo/object2/DRuntimeError.hpp
index 8a0ae33..957c848 100644
--- a/include/xo/object2/DRuntimeError.hpp
+++ b/include/xo/object2/DRuntimeError.hpp
@@ -50,7 +50,7 @@ namespace xo {
             ///@{
 
             std::size_t shallow_size() const noexcept;
-            DRuntimeError * shallow_copy(obj<AAllocator> mm) const noexcept;
+            DRuntimeError * shallow_move(obj<AAllocator> mm) const noexcept;
             std::size_t forward_children(obj<ACollector> gc) noexcept;
 
             ///@}
diff --git a/include/xo/object2/array/IGCObject_DArray.hpp b/include/xo/object2/array/IGCObject_DArray.hpp
index 4854eff..ab8a85f 100644
--- a/include/xo/object2/array/IGCObject_DArray.hpp
+++ b/include/xo/object2/array/IGCObject_DArray.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DArray & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DArray & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DArray & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DArray & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/boolean/IGCObject_DBoolean.hpp b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
index c437f0b..5bc6e0c 100644
--- a/include/xo/object2/boolean/IGCObject_DBoolean.hpp
+++ b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DBoolean & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DBoolean & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DBoolean & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DBoolean & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
index 323afd6..16fef8c 100644
--- a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
+++ b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DDictionary & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DDictionary & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DDictionary & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DDictionary & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/error/IGCObject_DRuntimeError.hpp b/include/xo/object2/error/IGCObject_DRuntimeError.hpp
index f09be05..62cc610 100644
--- a/include/xo/object2/error/IGCObject_DRuntimeError.hpp
+++ b/include/xo/object2/error/IGCObject_DRuntimeError.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DRuntimeError & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DRuntimeError & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DRuntimeError & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DRuntimeError & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/list/IGCObject_DList.hpp b/include/xo/object2/list/IGCObject_DList.hpp
index e601ce0..780ebda 100644
--- a/include/xo/object2/list/IGCObject_DList.hpp
+++ b/include/xo/object2/list/IGCObject_DList.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DList & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DList & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DList & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DList & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/number/IGCObject_DFloat.hpp b/include/xo/object2/number/IGCObject_DFloat.hpp
index f9040b1..b25e462 100644
--- a/include/xo/object2/number/IGCObject_DFloat.hpp
+++ b/include/xo/object2/number/IGCObject_DFloat.hpp
@@ -53,8 +53,8 @@ namespace xo {
             static size_type shallow_size(const DFloat & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DFloat & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DFloat & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DFloat & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/object2/number/IGCObject_DInteger.hpp b/include/xo/object2/number/IGCObject_DInteger.hpp
index b653212..a87f253 100644
--- a/include/xo/object2/number/IGCObject_DInteger.hpp
+++ b/include/xo/object2/number/IGCObject_DInteger.hpp
@@ -52,8 +52,8 @@ namespace xo {
             static size_type shallow_size(const DInteger & self) noexcept;
 
             // non-const methods
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(DInteger & self, obj<AAllocator> mm) noexcept;
+            /** move instance using allocator **/
+            static Opaque shallow_move(DInteger & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DInteger & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/src/object2/DArray.cpp b/src/object2/DArray.cpp
index a55fbf9..2ae4ddc 100644
--- a/src/object2/DArray.cpp
+++ b/src/object2/DArray.cpp
@@ -181,7 +181,7 @@ namespace xo {
         }
 
         DArray *
-        DArray::shallow_copy(obj<AAllocator> mm) const noexcept
+        DArray::shallow_move(obj<AAllocator> mm) const noexcept
         {
             DArray * copy = (DArray *)mm.alloc_copy((std::byte *)this);
 
diff --git a/src/object2/DBoolean.cpp b/src/object2/DBoolean.cpp
index ff5fa38..cb25f9e 100644
--- a/src/object2/DBoolean.cpp
+++ b/src/object2/DBoolean.cpp
@@ -36,7 +36,7 @@ namespace xo {
         }
 
         DBoolean *
-        DBoolean::shallow_copy(obj<AAllocator> mm) const noexcept
+        DBoolean::shallow_move(obj<AAllocator> mm) const noexcept
         {
             DBoolean * copy = (DBoolean *)mm.alloc_copy((std::byte *)this);
 
diff --git a/src/object2/DDictionary.cpp b/src/object2/DDictionary.cpp
index 263ea97..739fced 100644
--- a/src/object2/DDictionary.cpp
+++ b/src/object2/DDictionary.cpp
@@ -274,7 +274,7 @@ namespace xo {
         }
 
         DDictionary *
-        DDictionary::shallow_copy(obj<AAllocator> mm) noexcept
+        DDictionary::shallow_move(obj<AAllocator> mm) noexcept
         {
             return mm.std_copy_for(this);
         }
diff --git a/src/object2/DFloat.cpp b/src/object2/DFloat.cpp
index 7fc0bfb..f7f8ff3 100644
--- a/src/object2/DFloat.cpp
+++ b/src/object2/DFloat.cpp
@@ -34,7 +34,7 @@ namespace xo {
         }
 
         DFloat *
-        DFloat::shallow_copy(obj<AAllocator> mm) const noexcept
+        DFloat::shallow_move(obj<AAllocator> mm) const noexcept
         {
             DFloat * copy = (DFloat *)mm.alloc_copy((std::byte *)this);
 
diff --git a/src/object2/DInteger.cpp b/src/object2/DInteger.cpp
index 284806d..7cbcedf 100644
--- a/src/object2/DInteger.cpp
+++ b/src/object2/DInteger.cpp
@@ -34,7 +34,7 @@ namespace xo {
         }
 
         DInteger *
-        DInteger::shallow_copy(obj<AAllocator> mm) const noexcept
+        DInteger::shallow_move(obj<AAllocator> mm) const noexcept
         {
             DInteger * copy = (DInteger *)mm.alloc_copy((std::byte *)this);
 
diff --git a/src/object2/DList.cpp b/src/object2/DList.cpp
index 6f93147..be86907 100644
--- a/src/object2/DList.cpp
+++ b/src/object2/DList.cpp
@@ -185,7 +185,7 @@ namespace xo {
         }
 
         DList *
-        DList::shallow_copy(obj<AAllocator> mm) noexcept
+        DList::shallow_move(obj<AAllocator> mm) noexcept
         {
             return mm.std_copy_for(this);
         }
diff --git a/src/object2/DRuntimeError.cpp b/src/object2/DRuntimeError.cpp
index b683716..1f34596 100644
--- a/src/object2/DRuntimeError.cpp
+++ b/src/object2/DRuntimeError.cpp
@@ -59,7 +59,7 @@ namespace xo {
         }
 
         DRuntimeError *
-        DRuntimeError::shallow_copy(obj<AAllocator> mm) const noexcept
+        DRuntimeError::shallow_move(obj<AAllocator> mm) const noexcept
         {
             DRuntimeError * copy = (DRuntimeError *)mm.alloc_copy((std::byte *)this);
 
diff --git a/src/object2/IGCObject_DArray.cpp b/src/object2/IGCObject_DArray.cpp
index 9b28a3d..7cde63e 100644
--- a/src/object2/IGCObject_DArray.cpp
+++ b/src/object2/IGCObject_DArray.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DArray::shallow_copy(DArray & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DArray::shallow_move(DArray & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DArray::forward_children(DArray & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DBoolean.cpp b/src/object2/IGCObject_DBoolean.cpp
index e6bd600..ef503af 100644
--- a/src/object2/IGCObject_DBoolean.cpp
+++ b/src/object2/IGCObject_DBoolean.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DBoolean::shallow_copy(DBoolean & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DBoolean::shallow_move(DBoolean & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DBoolean::forward_children(DBoolean & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DDictionary.cpp b/src/object2/IGCObject_DDictionary.cpp
index 0466edd..9d4bae6 100644
--- a/src/object2/IGCObject_DDictionary.cpp
+++ b/src/object2/IGCObject_DDictionary.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DDictionary::shallow_copy(DDictionary & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DDictionary::shallow_move(DDictionary & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DDictionary::forward_children(DDictionary & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DFloat.cpp b/src/object2/IGCObject_DFloat.cpp
index 4b1ab56..a22a1b2 100644
--- a/src/object2/IGCObject_DFloat.cpp
+++ b/src/object2/IGCObject_DFloat.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DFloat::shallow_copy(DFloat & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DFloat::shallow_move(DFloat & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DFloat::forward_children(DFloat & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DInteger.cpp b/src/object2/IGCObject_DInteger.cpp
index fbb3190..4f74e5f 100644
--- a/src/object2/IGCObject_DInteger.cpp
+++ b/src/object2/IGCObject_DInteger.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DInteger::shallow_copy(DInteger & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DInteger::shallow_move(DInteger & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DInteger::forward_children(DInteger & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DList.cpp b/src/object2/IGCObject_DList.cpp
index 80cd7cd..2512cc3 100644
--- a/src/object2/IGCObject_DList.cpp
+++ b/src/object2/IGCObject_DList.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DList::shallow_copy(DList & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DList::shallow_move(DList & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DList::forward_children(DList & self, obj<ACollector> gc) noexcept -> size_type
diff --git a/src/object2/IGCObject_DRuntimeError.cpp b/src/object2/IGCObject_DRuntimeError.cpp
index 6d16781..cc75582 100644
--- a/src/object2/IGCObject_DRuntimeError.cpp
+++ b/src/object2/IGCObject_DRuntimeError.cpp
@@ -22,9 +22,9 @@ namespace xo {
         }
 
         auto
-        IGCObject_DRuntimeError::shallow_copy(DRuntimeError & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DRuntimeError::shallow_move(DRuntimeError & self, obj<AAllocator> mm) noexcept -> Opaque
         {
-            return self.shallow_copy(mm);
+            return self.shallow_move(mm);
         }
         auto
         IGCObject_DRuntimeError::forward_children(DRuntimeError & self, obj<ACollector> gc) noexcept -> size_type