diff --git a/src/main/java/me/topchetoeu/jscript/common/Instruction.java b/src/main/java/me/topchetoeu/jscript/common/Instruction.java
index f9d75ad..9b4cc65 100644
--- a/src/main/java/me/topchetoeu/jscript/common/Instruction.java
+++ b/src/main/java/me/topchetoeu/jscript/common/Instruction.java
@@ -56,9 +56,10 @@ public class Instruction {
         STORE_MEMBER_STR(0x4B),
 
         DEF_PROP(0x50),
-        KEYS(0x51),
-        TYPEOF(0x52),
-        OPERATION(0x53),
+        DEF_FIELD(0x51),
+        KEYS(0x52),
+        TYPEOF(0x53),
+        OPERATION(0x54),
 
         GLOB_GET(0x60),
         GLOB_SET(0x61),
@@ -341,8 +342,8 @@ public class Instruction {
         return new Instruction(Type.GLOB_DEF, name);
     }
     
-    public static Instruction globGet(String name) {
-        return new Instruction(Type.GLOB_GET, name);
+    public static Instruction globGet(String name, boolean force) {
+        return new Instruction(Type.GLOB_GET, name, force);
     }
     public static Instruction globSet(String name, boolean keep, boolean define) {
         return new Instruction(Type.GLOB_SET, name, keep, define);
@@ -435,7 +436,7 @@ public class Instruction {
         return new Instruction(Type.STORE_MEMBER_INT, key, false);
     }
     public static Instruction storeMember(int key, boolean keep) {
-        return new Instruction(Type.STORE_MEMBER_STR, key, keep);
+        return new Instruction(Type.STORE_MEMBER_INT, key, keep);
     }
 
     public static Instruction discard() {
@@ -453,8 +454,11 @@ public class Instruction {
         return new Instruction(Type.KEYS, own, onlyEnumerable);
     }
 
-    public static Instruction defProp() {
-        return new Instruction(Type.DEF_PROP);
+    public static Instruction defProp(boolean setter) {
+        return new Instruction(Type.DEF_PROP, setter);
+    }
+    public static Instruction defField() {
+        return new Instruction(Type.DEF_FIELD);
     }
 
     public static Instruction operation(Operation op) {
diff --git a/src/main/java/me/topchetoeu/jscript/runtime/InstructionRunner.java b/src/main/java/me/topchetoeu/jscript/runtime/InstructionRunner.java
index 094b2bb..de09d95 100644
--- a/src/main/java/me/topchetoeu/jscript/runtime/InstructionRunner.java
+++ b/src/main/java/me/topchetoeu/jscript/runtime/InstructionRunner.java
@@ -58,24 +58,29 @@ public class InstructionRunner {
     }
 
     private static Value execDefProp(Environment env, Instruction instr, Frame frame) {
-        var setterVal = frame.pop();
-        var getterVal = frame.pop();
+        var val = frame.pop();
         var key = frame.pop();
         var obj = frame.pop();
 
-        FunctionValue getter, setter;
+        FunctionValue accessor;
 
-        if (getterVal == Value.UNDEFINED) getter = null;
-        else if (getterVal instanceof FunctionValue) getter = (FunctionValue)getterVal;
+        if (val == Value.UNDEFINED) accessor = null;
+        else if (val instanceof FunctionValue func) accessor = func;
         else throw EngineException.ofType("Getter must be a function or undefined.");
 
-        if (setterVal == Value.UNDEFINED) setter = null;
-        else if (setterVal instanceof FunctionValue) setter = (FunctionValue)setterVal;
-        else throw EngineException.ofType("Setter must be a function or undefined.");
+        if ((boolean)instr.get(0)) obj.defineOwnMember(env, key, new PropertyMember(obj, null, accessor, true, true));
+        else obj.defineOwnMember(env, key, new PropertyMember(obj, accessor, null, true, true));
 
-        obj.defineOwnMember(env, key, new PropertyMember(obj, getter, setter, true, true));
+        frame.codePtr++;
+        return null;
+    }
+    private static Value execDefField(Environment env, Instruction instr, Frame frame) {
+        var val = frame.pop();
+        var key = frame.pop();
+        var obj = frame.pop();
+
+        obj.defineOwnMember(env, key, val);
 
-        frame.push(obj);
         frame.codePtr++;
         return null;
     }
@@ -449,10 +454,15 @@ public class InstructionRunner {
     }
     private static Value exexGlobGet(Environment env, Instruction instr, Frame frame) {
         var name = (String)instr.get(0);
-        var res = Value.global(env).getMemberOrNull(env, name);
+        if ((boolean)instr.get(1)) {
+            frame.push(Value.global(env).getMember(env, name));
+        }
+        else {
+            var res = Value.global(env).getMemberOrNull(env, name);
 
-        if (res == null) throw EngineException.ofSyntax(name + " is not defined");
-        else frame.push(res);
+            if (res == null) throw EngineException.ofSyntax(name + " is not defined");
+            else frame.push(res);
+        }
 
         frame.codePtr++;
         return null;
@@ -576,6 +586,7 @@ public class InstructionRunner {
 
             case KEYS: return execKeys(env, instr, frame);
             case DEF_PROP: return execDefProp(env, instr, frame);
+            case DEF_FIELD: return execDefField(env, instr, frame);
             case TYPEOF: return execTypeof(env, instr, frame);
             case DELETE: return execDelete(env, instr, frame);