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The main purpose of this change is to allow an ABI checker to understand when the list of SysCacheIdentifier changes, by switching all the routine declarations that relied on a signed integer for a syscache ID to this new type. This is going to be useful in the long-term for versions newer than v19 so as we will be able to check when the list of values in SysCacheIdentifier is updated in a non-ABI compliant fashion. Most of the changes of this commit are due to the new definition of SyscacheCallbackFunction, where a SysCacheIdentifier is now required for the syscache ID. It is a mechanical change, still slightly invasive. There are more areas in the tree that could be improved with an ABI checker in mind; this takes care of only one area. Reported-by: Tom Lane <tgl@sss.pgh.pa.us> Author: Andreas Karlsson <andreas@proxel.se> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/289125.1770913057@sss.pgh.pa.us