diff --git a/include/usearch/index.hpp b/include/usearch/index.hpp
index 4fe87109..15d56f9c 100644
--- a/include/usearch/index.hpp
+++ b/include/usearch/index.hpp
@@ -42,10 +42,13 @@
 #endif
 
 // Inferring hardware bitness: 32 vs 64
-#if __WORDSIZE == 64
+// https://stackoverflow.com/a/5273354
+#if INTPTR_MAX == INT64_MAX
 #define USEARCH_64BIT_ENV
-#else
+#elif INTPTR_MAX == INT32_MAX
 #define USEARCH_32BIT_ENV
+#else
+#error Unknown pointer size or missing size macros!
 #endif
 
 #if !defined(USEARCH_USE_OPENMP)
diff --git a/python/usearch/index.py b/python/usearch/index.py
index 19cbc324..e9ecd923 100644
--- a/python/usearch/index.py
+++ b/python/usearch/index.py
@@ -417,14 +417,16 @@ def __init__(
                 self._compiled.load(path)
 
     @staticmethod
-    def metadata(path: os.PathLike) -> dict:
+    def metadata(path: os.PathLike) -> Optional[dict]:
+        if not os.path.exists(path):
+            return None
         return index_metadata(path)
 
     @staticmethod
-    def restore(path: os.PathLike, view: bool = False) -> Index:
-        if not os.path.exists(path):
-            return None
+    def restore(path: os.PathLike, view: bool = False) -> Optional[Index]:
         meta = Index.metadata(path)
+        if not meta:
+            return None
         return Index(
             ndim=meta["dimensions"],
             dtype=meta["kind_scalar"],