diff --git a/src/tests.rs b/src/tests.rs
index b053adf..9be3e9b 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -191,3 +191,33 @@ fn is_93 () {
 		assert_eq! (actual, expected);
 	}
 }
+
+#[test]
+fn value_size () {
+	// Per https://www.lua.org/doc/jucs05.pdf,
+	// "The Implementation of Lua 5.0",
+	// 
+	// Lua's tagged union values are 12-16 bytes on a 32-bit system
+	// with 64-bit floats
+	// 
+	// It is very nice if LunarWaveVM is the same or better.
+	// There is some exploratory things in this test, too
+	
+	use std::{
+		mem::size_of,
+		rc::Rc,
+	};
+	
+	assert! (size_of::<Box <()>> () <= 8);
+	assert! (size_of::<std::rc::Rc <()>> () <= 8);
+	
+	pub enum Value {
+		Nil,
+		Boolean (bool),
+		Float (f64),
+		String (Rc <String>),
+	}
+	
+	assert_eq! (size_of::<Value> (), 16);
+	assert_eq! (size_of::<crate::state::Value> (), 16);
+}