Sorry, the impish version needs to be of course "1.2.11.dfsg-2ubuntu7.1" - to keep the upgrade path working. Here is the updated debdiff (debdiff_zlib_1.2.11.dfsg-2ubuntu7_to_zlib_1.2.11.dfsg-2ubuntu7.1_impish.diff).
Sorry, the impish version needs to be of course "1.2.11. dfsg-2ubuntu7. 1" - to keep the upgrade path working. zlib_1. 2.11.dfsg- 2ubuntu7_ to_zlib_ 1.2.11. dfsg-2ubuntu7. 1_impish. diff).
Here is the updated debdiff (debdiff_