See the output of diffoscope below:
diffoscope --exclude-command stat
/gnu/store/lvmrrr9a5hr0xj26snygszlmgrdv6nma-python-rpy2-3.0.4-1.19868a8{,-check}
--- /gnu/store/lvmrrr9a5hr0xj26snygszlmgrdv6nma-python-rpy2-3.0.4-1.19868a8
+++
/gnu/store/lvmrrr9a5hr0xj26snygszlmgrdv6nma-python-rpy2-3.0.4-1.19868a8-check
├── lib
│ ├── python3.7
│ │ ├── site-packages
│ │ │ ├── __pycache__
│ │ │ │ ├── _rinterface_cffi.cpython-37.pyc
│ │ │ │ │┄ xxd not available in path. Falling back to Python hexlify.
│ │ │ │ │ @@ -1,8 +1,8 @@
│ │ │ │ │ -420d0d0a000000003e42785d403e0000e3000000000000000000000000090000
│ │ │ │ │ +420d0d0a000000001342785d403e0000e3000000000000000000000000090000
│ │ │ │ │ 00400000007324000000640064016c005a0065006a0164026403640464056406
│ │ │ │ │ 6407640864098d075a0264015300290ae9000000004eda105f72696e74657266
│ │ │ │ │ 6163655f63666669690126000073c804000000001d0d0000000f0000400d0001
│ │ │ │ │ 10030000000f00010f0d000003110000000f0000590d0000031100001b010000
│ │ │ │ │ 000f0000600d000003110000000f0000240d000003110000000f0001150d0000
│ │ │ │ │ 03110000000f0000680d0000031100001b010000000f0000930d000003110000
│ │ │ │ │ 000f0000290d0001090300010d0300010e0300001e1100001f110000000f0000
This is fixed on core-update by commit 6bbb37a5459.
Maxim
