diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
index bd9401d..cb25fe0 100644
--- a/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
@@ -38,7 +38,7 @@ public class CompositionBundle implements Bundle {
                     composition = new Composition();
                     break;
                 case 1:
-                    double frameRate = args[0].asNumber();
+                    double frameRate = args[0].asDouble();
                     composition = new Composition(frameRate);
                     break;
                 case 2:
@@ -49,14 +49,14 @@ public class CompositionBundle implements Bundle {
                 case 3:
                     width = args[0].asInt();
                     height = args[1].asInt();
-                    frameRate = args[2].asNumber();
+                    frameRate = args[2].asDouble();
                     composition = new Composition(width, height, frameRate);
                     break;
                 case 4:
                 default:
                     width = args[0].asInt();
                     height = args[1].asInt();
-                    frameRate = args[2].asNumber();
+                    frameRate = args[2].asDouble();
                     val background = PropertyType.PAINT.<Paint>getFromHFX().apply(args[3]);
                     composition = new Composition(width, height, frameRate, background);
                     break;
diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/NodeUtilsBundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/NodeUtilsBundle.java
index a8f67e7..0f5e082 100644
--- a/app/src/main/java/com/annimon/hotarufx/bundles/NodeUtilsBundle.java
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/NodeUtilsBundle.java
@@ -41,7 +41,7 @@ public class NodeUtilsBundle implements Bundle {
             if (args.length == 2) {
                 val array = validator.requireArrayAt(1);
                 val dashList = array.stream()
-                        .map(Value::asNumber)
+                        .map(Value::asDouble)
                         .collect(Collectors.toList());
                 shape.getStrokeDashArray().setAll(dashList);
                 return NumberValue.ZERO;
diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/NodesBundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/NodesBundle.java
index 58280af..324ed13 100644
--- a/app/src/main/java/com/annimon/hotarufx/bundles/NodesBundle.java
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/NodesBundle.java
@@ -52,7 +52,7 @@ public class NodesBundle implements Bundle {
             val validator = Validator.with(args);
             val map = validator.requireMapAt(1);
             val points = validator.requireArrayAt(0).stream()
-                    .map(Value::asNumber)
+                    .map(Value::asDouble)
                     .collect(Collectors.toList());
             val node = new NodeValue(ctor.apply(points));
             node.fill(map);
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/ArrayValue.java b/app/src/main/java/com/annimon/hotarufx/lib/ArrayValue.java
index 33dddb9..df0a146 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/ArrayValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/ArrayValue.java
@@ -62,12 +62,7 @@ public class ArrayValue implements Value, Iterable<Value> {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast array to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast array to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/FunctionValue.java b/app/src/main/java/com/annimon/hotarufx/lib/FunctionValue.java
index 82b6982..b835943 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/FunctionValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/FunctionValue.java
@@ -26,12 +26,7 @@ public class FunctionValue implements Value {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast function to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast function to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/InterpolatorValue.java b/app/src/main/java/com/annimon/hotarufx/lib/InterpolatorValue.java
index 4f121d7..a17a98e 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/InterpolatorValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/InterpolatorValue.java
@@ -24,12 +24,7 @@ public class InterpolatorValue implements Value {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast interpolator to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast interpolator to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/MapValue.java b/app/src/main/java/com/annimon/hotarufx/lib/MapValue.java
index fb79d17..2994da4 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/MapValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/MapValue.java
@@ -46,12 +46,7 @@ public class MapValue implements Value, Iterable<Map.Entry<String, Value>> {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast map to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast map to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/NodeValue.java b/app/src/main/java/com/annimon/hotarufx/lib/NodeValue.java
index ee80358..64e9ab4 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/NodeValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/NodeValue.java
@@ -116,12 +116,7 @@ public class NodeValue implements Value {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast node to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast node to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/NumberValue.java b/app/src/main/java/com/annimon/hotarufx/lib/NumberValue.java
index bfc40d9..7cfe3dc 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/NumberValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/NumberValue.java
@@ -55,34 +55,9 @@ public class NumberValue implements Value {
         return value.intValue() != 0;
     }
 
-    public byte asByte() {
-        return value.byteValue();
-    }
-
-    public short asShort() {
-        return value.shortValue();
-    }
-
     @Override
-    public int asInt() {
-        return value.intValue();
-    }
-
-    public long asLong() {
-        return value.longValue();
-    }
-
-    public float asFloat() {
-        return value.floatValue();
-    }
-
-    public double asDouble() {
-        return value.doubleValue();
-    }
-
-    @Override
-    public double asNumber() {
-        return value.doubleValue();
+    public Number asNumber() {
+        return value;
     }
 
     @Override
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/PropertyValue.java b/app/src/main/java/com/annimon/hotarufx/lib/PropertyValue.java
index 6d90aa1..7be33ed 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/PropertyValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/PropertyValue.java
@@ -108,12 +108,7 @@ public class PropertyValue implements Value {
     }
 
     @Override
-    public int asInt() {
-        throw new TypeException("Cannot cast property to integer");
-    }
-
-    @Override
-    public double asNumber() {
+    public Number asNumber() {
         throw new TypeException("Cannot cast property to number");
     }
 
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/StringValue.java b/app/src/main/java/com/annimon/hotarufx/lib/StringValue.java
index 08c9192..2f4f6a8 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/StringValue.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/StringValue.java
@@ -4,8 +4,6 @@ import java.util.Objects;
 
 public class StringValue implements Value {
 
-    public static final StringValue EMPTY = new StringValue("");
-
     private final String value;
 
     public StringValue(String value) {
@@ -36,7 +34,7 @@ public class StringValue implements Value {
     }
 
     @Override
-    public double asNumber() {
+    public double asDouble() {
         try {
             return Double.parseDouble(value);
         } catch (NumberFormatException e) {
@@ -44,6 +42,11 @@ public class StringValue implements Value {
         }
     }
 
+    @Override
+    public Number asNumber() {
+        return asDouble();
+    }
+
     @Override
     public String asString() {
         return value;
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/Value.java b/app/src/main/java/com/annimon/hotarufx/lib/Value.java
index 474bb43..c4acec2 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/Value.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/Value.java
@@ -4,9 +4,19 @@ public interface Value extends Comparable<Value> {
 
     Object raw();
 
-    int asInt();
+    default boolean asBoolean() {
+        return asInt() != 0;
+    }
 
-    double asNumber();
+    default int asInt() {
+        return asNumber().intValue();
+    }
+
+    default double asDouble() {
+        return asNumber().doubleValue();
+    }
+
+    Number asNumber();
 
     String asString();
 
diff --git a/app/src/main/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitor.java b/app/src/main/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitor.java
index c60c84e..7365438 100644
--- a/app/src/main/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitor.java
+++ b/app/src/main/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitor.java
@@ -117,12 +117,12 @@ public class InterpreterVisitor implements ResultVisitor<Value, Context> {
         final double frame;
         switch (node.operator) {
             case SECONDS:
-                frame = value.asNumber() * frameRate;
+                frame = value.asDouble() * frameRate;
                 break;
 
             case MILLISECONDS:
             default:
-                frame = (value.asNumber() * frameRate) / 1000d;
+                frame = (value.asDouble() * frameRate) / 1000d;
                 break;
         }
         return NumberValue.of(frame);
diff --git a/app/src/main/java/com/annimon/hotarufx/visual/PropertyType.java b/app/src/main/java/com/annimon/hotarufx/visual/PropertyType.java
index 4379b56..b3458ed 100644
--- a/app/src/main/java/com/annimon/hotarufx/visual/PropertyType.java
+++ b/app/src/main/java/com/annimon/hotarufx/visual/PropertyType.java
@@ -23,7 +23,7 @@ import lombok.val;
 @RequiredArgsConstructor(access = AccessLevel.PACKAGE)
 public enum PropertyType {
 
-    BOOLEAN(v -> v.asInt() != 0, o -> NumberValue.fromBoolean(Boolean.TRUE.equals(o))),
+    BOOLEAN(Value::asBoolean, o -> NumberValue.fromBoolean(Boolean.TRUE.equals(o))),
     NUMBER(toNumber(), o -> NumberValue.of((Number) o)),
     STRING(Value::asString, o -> new StringValue(String.valueOf(o))),
     NODE(toNode(), fromNode()),
@@ -50,7 +50,7 @@ public enum PropertyType {
             if (value.type() == Types.NUMBER) {
                 return ((NumberValue) value).raw();
             }
-            return value.asNumber();
+            return value.asDouble();
         };
     }
 
@@ -82,12 +82,12 @@ public enum PropertyType {
                 val map = ((MapValue) value).getMap();
                 val family = map.getOrDefault("family", new StringValue(Font.getDefault().getFamily())).asString();
                 val weight = map.getOrDefault("weight", NumberValue.of(FontWeight.NORMAL.getWeight())).asInt();
-                val isItalic = map.getOrDefault("italic", NumberValue.ZERO).asInt() != 0;
+                val isItalic = map.getOrDefault("italic", NumberValue.ZERO).asBoolean();
                 val posture = isItalic ? FontPosture.ITALIC : FontPosture.REGULAR;
-                val size = map.getOrDefault("size", NumberValue.MINUS_ONE).asNumber();
+                val size = map.getOrDefault("size", NumberValue.MINUS_ONE).asDouble();
                 return Font.font(family, FontWeight.findByWeight(weight), posture, size);
             }
-            return Font.font(value.asNumber());
+            return Font.font(value.asDouble());
         };
     }
 
diff --git a/app/src/test/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitorTest.java b/app/src/test/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitorTest.java
index 5c42a6d..13c8244 100644
--- a/app/src/test/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitorTest.java
+++ b/app/src/test/java/com/annimon/hotarufx/parser/visitors/InterpreterVisitorTest.java
@@ -126,25 +126,25 @@ class InterpreterVisitorTest {
         Value value;
 
         value = eval("rate(30) t = 1 sec", context);
-        assertThat(value.asNumber(), closeTo(30, 0.0001));
+        assertThat(value.asDouble(), closeTo(30, 0.0001));
 
         value = eval("rate(30) t = 5 sec", context);
-        assertThat(value.asNumber(), closeTo(150, 0.0001));
+        assertThat(value.asDouble(), closeTo(150, 0.0001));
 
         value = eval("rate(30) t = 0.5 sec", context);
-        assertThat(value.asNumber(), closeTo(15, 0.0001));
+        assertThat(value.asDouble(), closeTo(15, 0.0001));
 
         value = eval("rate(30) t = 1000 ms", context);
-        assertThat(value.asNumber(), closeTo(30, 0.0001));
+        assertThat(value.asDouble(), closeTo(30, 0.0001));
 
         value = eval("rate(30) t = 333 ms", context);
-        assertThat(value.asNumber(), closeTo(10, 0.01));
+        assertThat(value.asDouble(), closeTo(10, 0.01));
 
         value = eval("rate(25) t = 1 sec", context);
-        assertThat(value.asNumber(), closeTo(25, 0.0001));
+        assertThat(value.asDouble(), closeTo(25, 0.0001));
 
         value = eval("rate(25) t = 1000 ms", context);
-        assertThat(value.asNumber(), closeTo(25, 0.0001));
+        assertThat(value.asDouble(), closeTo(25, 0.0001));
     }
 
     @Test