code/modules/client/preferences_savefile.dm 
| SAVEFILE_VERSION_MAX | This is the current version, anything below this will attempt to update (if it's not obsolete) You do not need to raise this if you are adding new values that have sane defaults. Only raise this value when changing the meaning/format/name/layout of an existing value where you would want the updater procs below to run |
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Define Details
SAVEFILE_VERSION_MAX 
This is the current version, anything below this will attempt to update (if it's not obsolete) You do not need to raise this if you are adding new values that have sane defaults. Only raise this value when changing the meaning/format/name/layout of an existing value where you would want the updater procs below to run