refactor!: bullet getter and setter

packages/forge2d/example/web/circle_stress.dart

@@ -122,7 +122,7 @@ class CircleStress extends Demo {
         body.createFixture(fixtureDef);
       }
 
-      body.setBullet(false);
+      body.isBullet = false;
 
       // Create an empty ground body.
       final bodyDef = BodyDef();

packages/forge2d/lib/src/dynamics/body.dart

@@ -598,21 +598,32 @@ class Body {
     }
   }
 
-  /// Is this body treated like a bullet for continuous collision detection?
-  bool isBullet() {
-    return (flags & bulletFlag) == bulletFlag;
-  }
-
+  /// {@template isBullet}
   /// Whether this body should be treated like a bullet for continuous collision
   /// detection.
-  void setBullet(bool flag) {
+  ///
+  /// Fast moving dynamic bodies should be labeled as bullets so that they
+  /// do not tunnel through other moving objects.
+  ///
+  /// **Warning:** You should use this flag sparingly since it increases
+  /// processing time.
+  ///
+  /// See also:
+  ///
+  /// * [Box2D bullets documentation](https://box2d.org/documentation/md__d_1__git_hub_box2d_docs_dynamics.html)
+  /// * [Box2D bullet member data definition](https://box2d.org/documentation/structb2_body_def.html#a7c0047c9a98a1d20614eeddcdbce7586)
+  /// {@endtemplate}
+  set isBullet(bool flag) {
     if (flag) {
       flags |= bulletFlag;
     } else {
       flags &= ~bulletFlag;
     }
   }
 
+  /// {@macro isBullet}
+  bool get isBullet => (flags & bulletFlag) == bulletFlag;
+
   /// You can disable sleeping on this body. If you disable sleeping, the body
   /// will be woken.
   void setSleepingAllowed(bool flag) {

packages/forge2d/lib/src/dynamics/world.dart

@@ -723,8 +723,8 @@ class World {
             continue;
           }
 
-          final collideA = bodyA.isBullet() || typeA != BodyType.dynamic;
-          final collideB = bodyB.isBullet() || typeB != BodyType.dynamic;
+          final collideA = bodyA.isBullet || typeA != BodyType.dynamic;
+          final collideB = bodyB.isBullet || typeB != BodyType.dynamic;
 
           // Are these two non-bullet dynamic bodies?
           if (collideA == false && collideB == false) {
@@ -838,8 +838,8 @@ class World {
             // Only add static, kinematic, or bullet bodies.
             final other = contact.getOtherBody(body);
             if (other.bodyType == BodyType.dynamic &&
-                body.isBullet() == false &&
-                other.isBullet() == false) {
+                !body.isBullet &&
+                !other.isBullet) {
               continue;
             }
 

packages/forge2d/test/dynamics/body_test.dart

@@ -4,6 +4,23 @@ import 'package:test/scaffolding.dart';
 
 void main() {
   group('Body', () {
+    group('isBullet', () {
+      test('is false by default', () {
+        final body = Body(BodyDef(), World());
+        expect(body.isBullet, equals(false));
+      });
+
+      test('can change', () {
+        final body = Body(BodyDef(), World());
+        const newBulletValue = true;
+        expect(body.isBullet, isNot(equals(newBulletValue)));
+
+        body.isBullet = newBulletValue;
+
+        expect(body.isBullet, equals(newBulletValue));
+      });
+    });
+
     group('gravityOverride', () {
       test("body doesn't move when is zero", () {
         final gravity = Vector2(10, 10);