fix Function#applyDouble

common/addons/structure-terrascript-loader/src/main/java/com/dfsek/terra/addons/terrascript/parser/lang/functions/Function.java

@@ -16,7 +16,7 @@ import com.dfsek.terra.addons.terrascript.tokenizer.Position;
 public interface Function<T> extends Returnable<T> {
     @Override
     default double applyDouble(ImplementationArguments implementationArguments, Scope scope) {
-        return (Double) apply(implementationArguments, scope);
+        return ((Number) apply(implementationArguments, scope)).doubleValue();
     }
     
     @Override