2 files changed, 19 insertions, 2 deletions
diff --git a/object/blob/clone.go b/object/blob/clone.go
new file mode 100644
index 00000000..7106c3aa
--- /dev/null
+++ b/object/blob/clone.go
@@ -0,0 +1,11 @@
+package blob
+
+import "bytes"
+
+// Clone returns a deep copy of the blob
+// whose Data is independent of any memory the original may alias.
+//
+// Labels: Life-Independent.
+func (blob *Blob) Clone() *Blob {
+	return &Blob{Data: bytes.Clone(blob.Data)}
+}
diff --git a/object/blob/parse.go b/object/blob/parse.go
index c013af96..1796d42f 100644
--- a/object/blob/parse.go
+++ b/object/blob/parse.go
@@ -2,7 +2,13 @@ package blob
 
 // Parse decodes a blob object body.
 //
-// Labels: Life-Independent.
+// The returned blob aliases body:
+// its Data shares the same backing array,
+// so the blob inherits body's lifetime
+// and must not be mutated unless body may be.
+// Use [Blob.Clone] for an independent copy.
+//
+// Labels: Life-Parent, Mut-No.
 func Parse(body []byte) (*Blob, error) {
-	return &Blob{Data: append([]byte(nil), body...)}, nil
+	return &Blob{Data: body}, nil
 }