message: Switch starlark_type! to use ConstFrozenString
  Summary: Better than ConstFrozenValue with less atomics and less memory overhead.
diff: @@ -25,8 +25,9 @@ macro_rules! starlark_type {
  $typ
  }
  fn get_type_value(&self) -> $crate::values::FrozenValue {
  - static RES: $crate::values::ConstFrozenValue =
  - $crate::values::ConstFrozenValue::new($typ);
  + const N: usize = $typ.len();
  + static RES: $crate::values::ConstFrozenStringN<N> =
  + $crate::values::ConstFrozenStringN::new($typ);
  RES.unpack()
  }
  };
  