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Summary
None
Purpose of change
If the migration did not explicitly set reset_item_vars to true or to false, the value remained uninitialized.
I found this via -fsanitize=undefined
reset_item_vars was introduced in 646fa4d. Based on the fact @irwiss decided to add this boolean switch and set it to true for several migrations I assume the intended default value is false.
Describe the solution
Always initialize reset_item_vars to false
Testing
-fsanitize=undefined no longer reports the error