#134 Made number.pow object strong typed

src/main/eo/org/eolang/math/number.eo

@@ -192,7 +192,7 @@
           self-as-int.plus 1
 
   # Make ^.n power x
-  [x] > pow /?
+  [x] > pow /number
 
   # Make ^.n power x
   # @todo #21:30 min. Add an ability to raise a number to float power.

src/main/java/EOorg/EOeolang/EOmath/EOnumber$EOpow.java

@@ -24,7 +24,6 @@
 // @checkstyle PackageNameCheck (1 line)
 package EOorg.EOeolang.EOmath;
 
-import EOorg.EOeolang.EOerror;
 import org.eolang.AtComposite;
 import org.eolang.AtFree;
 import org.eolang.Data;
@@ -89,7 +88,11 @@ public final class EOnumber$EOpow extends PhDefault {
                             )
                         );
                     }
-                    return phi;
+                    return new PhWith(
+                        new EOnumber(Phi.Φ),
+                        "n",
+                        phi
+                    );
                 }
             )
         );