As requested.
Output from `guix describe`:
guix 34372d3
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 34372d3905e17c880180f811e5b5f83e423e9025
Output from `diffoscope` for three different packages that `guix challenge`
highlighted as differing:
--- /gnu/store/9z98cvjm7p7z21xdid1ryydxy5vyz6wr-python-3.7.0
+++ 9z98cvjm7p7z21xdid1ryydxy5vyz6wr-python-3.7.0
@@ -1 +1 @@
-type: directory
+type: file
--- /gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4
+++ 9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4
@@ -1 +1 @@
-type: directory
+type: file
--- /gnu/store/lpwrv02rljddp84km9md8i0820p55dmk-guix-system
+++ lpwrv02rljddp84km9md8i0820p55dmk-guix-system
@@ -1 +1 @@
-type: directory
+type: file
