Verify that RCs are equivalent to releases

test/test.bzl

diff --git a/test/test.bzl b/test/test.bzl
index 0b03bb0..adb94b0 100644
--- a/test/test.bzl
+++ b/test/test.bzl
@@ -38,6 +38,7 @@
     # some basic version parsing/comparison tests
     _assert_lt("6.0.0", "6.0.1")
     _assert_lt("6.0.0rc3", "6.0.0")
+    _assert_lt("6.0.0", "6.0.0rc3")
     _assert_lt("6.0.0-pre8.9.10", "6.0.0rc3")
     _assert_lt("6.0.0 some build metadata", "6.1.0 some other build metadata")
     _assert_lt("6.0.0", "")