fix: missing unboxing in interpreter when loading initialized value (#4512)

Fixes #4457

src/library/compiler/ir_interpreter.cpp

@@ -796,7 +796,7 @@ private:
         }
         if (object * const * o = g_init_globals->find(fn)) {
             // persistent, so no `inc` needed
-            return *o;
+            return type_is_scalar(t) ? unbox_t(*o, t) : *o;
         }
 
         symbol_cache_entry e = lookup_symbol(fn);

tests/pkg/initialize/.gitignore

@@ -0,0 +1 @@
+/.lake

tests/pkg/initialize/Initialize.lean

@@ -0,0 +1,5 @@
+import Initialize.Basic
+
+/-- info: 42 -/
+#guard_msgs in
+#eval initNat

tests/pkg/initialize/Initialize/Basic.lean

@@ -0,0 +1 @@
+initialize initNat : Nat ← pure 42

tests/pkg/initialize/lakefile.toml

@@ -0,0 +1,5 @@
+name = "initialize"
+defaultTargets = ["Initialize"]
+
+[[lean_lib]]
+name = "Initialize"

tests/pkg/initialize/test.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+rm -rf .lake/build
+lake build