From 87e9a63f922cc8926011de9337c79b91f3e1be4c Mon Sep 17 00:00:00 2001
From: Jerry James <loganjerry@gmail.com>
Date: Apr 19 2021 20:24:12 +0000
Subject: But do not modify the version objects in place!


---

diff --git a/opam2rpm/version.py b/opam2rpm/version.py
index 2f48e92..4d997af 100644
--- a/opam2rpm/version.py
+++ b/opam2rpm/version.py
@@ -96,11 +96,13 @@ def add_zeroes(elems1: List[str], elems2: List[str]) -> List[Tuple[str, str]]:
     element pairs, pretend the other has dot-zero pairs to match.  This is
     necessary for tilde comparisons to work on versions of differing length.
     """
-    while len(elems1) + 1 < len(elems2) and elems2[len(elems1)] == '.':
-        elems1 += ['.', '0']
-    while len(elems2) + 1 < len(elems1) and elems1[len(elems2)] == '.':
-        elems2 += ['.', '0']
-    return zip_longest(elems1, elems2)
+    e1 = list(elems1)
+    e2 = list(elems2)
+    while len(e1) + 1 < len(e2) and e2[len(e1)] == '.':
+        e1 += ['.', '0']
+    while len(e2) + 1 < len(e1) and e1[len(e2)] == '.':
+        e2 += ['.', '0']
+    return zip_longest(e1, e2)
 
 @final
 class Version: