diff --git a/eo-runtime/src/main/eo/org/eolang/bool.eo b/eo-runtime/src/main/eo/org/eolang/bool.eo
index 14d2d9142e..d87b6198d8 100644
--- a/eo-runtime/src/main/eo/org/eolang/bool.eo
+++ b/eo-runtime/src/main/eo/org/eolang/bool.eo
@@ -26,9 +26,8 @@
 +rt jvm org.eolang:eo-runtime:0.0.0
 +version 0.0.0
 
-[data] > bool
-  data > @
-  data > as-bytes
+[as-bytes] > bool
+  as-bytes > @
 
   # Equal to another object?
   [x] > eq
diff --git a/eo-runtime/src/main/eo/org/eolang/float.eo b/eo-runtime/src/main/eo/org/eolang/float.eo
index ad3a27d78f..c52419b756 100644
--- a/eo-runtime/src/main/eo/org/eolang/float.eo
+++ b/eo-runtime/src/main/eo/org/eolang/float.eo
@@ -26,9 +26,8 @@
 +rt jvm org.eolang:eo-runtime:0.0.0
 +version 0.0.0
 
-[data] > float
-  data > @
-  data > as-bytes
+[as-bytes] > float
+  as-bytes > @
 
   # Tests that $ = x
   [x] > eq
diff --git a/eo-runtime/src/main/eo/org/eolang/int.eo b/eo-runtime/src/main/eo/org/eolang/int.eo
index 36d1f2d2b1..f22983e7bc 100644
--- a/eo-runtime/src/main/eo/org/eolang/int.eo
+++ b/eo-runtime/src/main/eo/org/eolang/int.eo
@@ -26,9 +26,8 @@
 +rt jvm org.eolang:eo-runtime:0.0.0
 +version 0.0.0
 
-[data] > int
-  data > @
-  data > as-bytes
+[as-bytes] > int
+  as-bytes > @
 
   # Tests that $ = x
   [x] > eq
diff --git a/eo-runtime/src/main/eo/org/eolang/string.eo b/eo-runtime/src/main/eo/org/eolang/string.eo
index 629b3b7c1e..816192820f 100644
--- a/eo-runtime/src/main/eo/org/eolang/string.eo
+++ b/eo-runtime/src/main/eo/org/eolang/string.eo
@@ -26,9 +26,8 @@
 +rt jvm org.eolang:eo-runtime:0.0.0
 +version 0.0.0
 
-[data] > string
-  data > @
-  data > as-bytes
+[as-bytes] > string
+  as-bytes > @
 
   # Is true if both objects are equal
   [x] > eq
diff --git a/eo-runtime/src/main/java/org/eolang/Data.java b/eo-runtime/src/main/java/org/eolang/Data.java
index a95d749945..eacadf0f2b 100644
--- a/eo-runtime/src/main/java/org/eolang/Data.java
+++ b/eo-runtime/src/main/java/org/eolang/Data.java
@@ -250,14 +250,11 @@ private static Phi toPhi(final Object obj, final Phi value) {
                 );
             }
             if (delta) {
-                phi.attr("Δ").put(value);
+                phi.attr(Attr.LAMBDA).put(value);
             } else {
-                phi.attr(0).put(
-                    new PhWith(
-                        new EObytes(Phi.Φ),
-                        "Δ", new Data.Value<>(bytes)
-                    )
-                );
+                final Phi bts = new EObytes(Phi.Φ);
+                bts.attr(Attr.LAMBDA).put(new Data.Value<>(bytes));
+                phi.attr(0).put(bts);
             }
             return phi;
         }