diff --git a/.vscode/launch.json b/.vscode/launch.json
index c67b7f8..ccb8606 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -7,12 +7,12 @@
     {
       "type": "lldb",
       "request": "launch",
-      "name": "Debug executable 'value_script'",
+      "name": "Debug executable 'vstc'",
       "cargo": {
         "args": [
           "build",
-          "--bin=vstc",
-          "--package=value_script"
+          "-p",
+          "vstc"
         ],
         "filter": {
           "name": "vstc",
@@ -42,4 +42,4 @@
       "cwd": "${workspaceFolder}"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/valuescript_vm/src/bytecode_decoder.rs b/valuescript_vm/src/bytecode_decoder.rs
index 1ae1459..b15d756 100644
--- a/valuescript_vm/src/bytecode_decoder.rs
+++ b/valuescript_vm/src/bytecode_decoder.rs
@@ -95,60 +95,70 @@ impl BytecodeDecoder {
     return BytecodeType::from_byte(self.peek_byte());
   }
 
-  pub fn decode_val(&mut self, registers: &Vec<Val>) -> Val {
+  pub fn decode_vallish<'a>(&mut self, registers: &'a Vec<Val>) -> Vallish<'a> {
+    use Vallish::*;
+
     return match self.decode_type() {
       BytecodeType::End => panic!("Cannot decode end"),
-      BytecodeType::Void => Val::Void,
-      BytecodeType::Undefined => Val::Undefined,
-      BytecodeType::Null => Val::Null,
-      BytecodeType::False => Val::Bool(false),
-      BytecodeType::True => Val::Bool(true),
-      BytecodeType::SignedByte => (self.decode_signed_byte() as f64).to_val(),
-      BytecodeType::Number => self.decode_number().to_val(),
-      BytecodeType::String => self.decode_string().to_val(),
-      BytecodeType::Array => self.decode_vec_val(registers).to_val(),
+      BytecodeType::Void => Own(Val::Void),
+      BytecodeType::Undefined => Own(Val::Undefined),
+      BytecodeType::Null => Own(Val::Null),
+      BytecodeType::False => Own(Val::Bool(false)),
+      BytecodeType::True => Own(Val::Bool(true)),
+      BytecodeType::SignedByte => Own((self.decode_signed_byte() as f64).to_val()),
+      BytecodeType::Number => Own(self.decode_number().to_val()),
+      BytecodeType::String => Own(self.decode_string().to_val()),
+      BytecodeType::Array => Own(self.decode_vec_val(registers).to_val()),
       BytecodeType::Object => {
         let mut string_map: BTreeMap<String, Val> = BTreeMap::new();
         let mut symbol_map: BTreeMap<VsSymbol, Val> = BTreeMap::new();
 
         while self.peek_type() != BytecodeType::End {
-          let key = self.decode_val(registers);
+          let key = self.decode_vallish(registers);
           let value = self.decode_val(registers);
 
-          match key {
+          match key.get_ref() {
             Val::String(string) => string_map.insert(string.to_string(), value),
-            Val::Symbol(symbol) => symbol_map.insert(symbol, value),
+            Val::Symbol(symbol) => symbol_map.insert(symbol.clone(), value),
             key => string_map.insert(key.to_string(), value),
           };
         }
 
         self.decode_type(); // End (TODO: assert)
 
-        VsObject {
-          string_map,
-          symbol_map,
-          prototype: None,
-        }
-        .to_val()
+        Own(
+          VsObject {
+            string_map,
+            symbol_map,
+            prototype: None,
+          }
+          .to_val(),
+        )
       }
-      BytecodeType::Function => self.decode_function(false),
-      BytecodeType::Pointer => self.decode_pointer(registers),
-      BytecodeType::Register => match registers[self.decode_register_index().unwrap()].clone() {
-        Val::Void => Val::Undefined,
-        val => val,
+      BytecodeType::Function => Own(self.decode_function(false)),
+      BytecodeType::Pointer => Own(self.decode_pointer(registers)),
+      BytecodeType::Register => match registers[self.decode_register_index().unwrap()] {
+        Val::Void => Own(Val::Undefined),
+        ref val => Ref(val),
       },
-      BytecodeType::Builtin => BUILTIN_VALS[self.decode_varsize_uint()](),
-      BytecodeType::Class => VsClass {
-        constructor: self.decode_val(registers),
-        instance_prototype: self.decode_val(registers),
-      }
-      .to_val(),
-      BytecodeType::BigInt => self.decode_bigint().to_val(),
-      BytecodeType::GeneratorFunction => self.decode_function(true),
+      BytecodeType::Builtin => Own(BUILTIN_VALS[self.decode_varsize_uint()]()),
+      BytecodeType::Class => Own(
+        VsClass {
+          constructor: self.decode_val(registers),
+          instance_prototype: self.decode_val(registers),
+        }
+        .to_val(),
+      ),
+      BytecodeType::BigInt => Own(self.decode_bigint().to_val()),
+      BytecodeType::GeneratorFunction => Own(self.decode_function(true)),
       BytecodeType::Unrecognized => panic!("Unrecognized bytecode type at {}", self.pos - 1),
     };
   }
 
+  pub fn decode_val(&mut self, registers: &Vec<Val>) -> Val {
+    return self.decode_vallish(registers).get_val();
+  }
+
   pub fn decode_vec_val(&mut self, registers: &Vec<Val>) -> Vec<Val> {
     let mut vals: Vec<Val> = Vec::new();
 
@@ -298,3 +308,24 @@ impl BytecodeDecoder {
     return InstructionByte::from_byte(self.decode_byte());
   }
 }
+
+pub enum Vallish<'a> {
+  Own(Val),
+  Ref(&'a Val),
+}
+
+impl<'a> Vallish<'a> {
+  pub fn get_val(self) -> Val {
+    match self {
+      Vallish::Own(val) => val,
+      Vallish::Ref(val) => val.clone(),
+    }
+  }
+
+  pub fn get_ref(&self) -> &Val {
+    match self {
+      Vallish::Own(val) => val,
+      Vallish::Ref(val) => val,
+    }
+  }
+}
diff --git a/valuescript_vm/src/bytecode_stack_frame.rs b/valuescript_vm/src/bytecode_stack_frame.rs
index f1104df..c15c1a3 100644
--- a/valuescript_vm/src/bytecode_stack_frame.rs
+++ b/valuescript_vm/src/bytecode_stack_frame.rs
@@ -32,13 +32,13 @@ pub struct CatchSetting {
 }
 
 impl BytecodeStackFrame {
-  pub fn apply_unary_op(&mut self, op: fn(input: Val) -> Val) {
-    let input = self.decoder.decode_val(&self.registers);
+  pub fn apply_unary_op(&mut self, op: fn(input: &Val) -> Val) {
+    let input = self.decoder.decode_vallish(&self.registers);
 
     let register_index = self.decoder.decode_register_index();
 
     if register_index.is_some() {
-      self.registers[register_index.unwrap()] = op(input);
+      self.registers[register_index.unwrap()] = op(input.get_ref());
     }
   }
 
diff --git a/valuescript_vm/src/operations.rs b/valuescript_vm/src/operations.rs
index aaeda5f..3e78af4 100644
--- a/valuescript_vm/src/operations.rs
+++ b/valuescript_vm/src/operations.rs
@@ -43,7 +43,7 @@ pub fn op_plus(left: Val, right: Val) -> Result<Val, Val> {
   return Ok(Val::Number(left_prim.to_number() + right_prim.to_number()));
 }
 
-pub fn op_unary_plus(input: Val) -> Val {
+pub fn op_unary_plus(input: &Val) -> Val {
   match input.as_bigint_data() {
     Some(bigint) => Val::BigInt(bigint),
     _ => Val::Number(input.to_number()),
@@ -60,7 +60,7 @@ pub fn op_minus(left: Val, right: Val) -> Result<Val, Val> {
   }
 }
 
-pub fn op_unary_minus(input: Val) -> Val {
+pub fn op_unary_minus(input: &Val) -> Val {
   match input.as_bigint_data() {
     Some(bigint) => Val::BigInt(-bigint),
     _ => Val::Number(-input.to_number()),
@@ -170,7 +170,7 @@ pub fn op_or(left: Val, right: Val) -> Result<Val, Val> {
   Ok(if left.is_truthy() { left } else { right })
 }
 
-pub fn op_not(input: Val) -> Val {
+pub fn op_not(input: &Val) -> Val {
   return Val::Bool(!input.is_truthy());
 }
 
@@ -282,7 +282,7 @@ pub fn op_bit_or(left: Val, right: Val) -> Result<Val, Val> {
   }
 }
 
-pub fn op_bit_not(input: Val) -> Val {
+pub fn op_bit_not(input: &Val) -> Val {
   match input.as_bigint_data() {
     Some(bigint) => Val::BigInt(!bigint),
     None => {
@@ -341,7 +341,7 @@ pub fn op_right_shift_unsigned(left: Val, right: Val) -> Result<Val, Val> {
   }
 }
 
-pub fn op_typeof(input: Val) -> Val {
+pub fn op_typeof(input: &Val) -> Val {
   use VsType::*;
 
   match input.typeof_() {