fix: update variable types in ExpressionParserTest for consistency in addition tests

Author: sharrlotte

src/main/java/mindustrytool/workflow/expressions/ExpressionParser.java

@@ -216,7 +216,11 @@ public <T> T evaluate(Class<T> type, String expr, Map<String, Object> variables)
             } else if (WorkflowNode.VARIABLE_PATTERN.matcher(token).matches()) {
                 var variableName = token.replace("{{", "").replace("}}", "").trim();
                 var variable = consume(variableName, variables);
-                stack.push(variable);
+                if (variable instanceof Number number) {
+                    stack.push(number.doubleValue());
+                } else {
+                    stack.push(variable);
+                }
                 Log.debug("Add variable: " + variableName);
             } else {
                 try {

src/test/java/ExpressionParserTest.java

@@ -9,7 +9,7 @@
 public class ExpressionParserTest {
     ExpressionParser parser = new ExpressionParser();
 
-    Map<String, Object> variables = Map.of("a", 1, "b", 2);
+    Map<String, Object> variables = Map.of("a", 1d, "b", 2d);
 
     @Test
     void testAddition() {