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I have a which tracks ids for some structs for different users.

mapping (address => uint[]) usersStuff

This mapping for each user can grow or shrink.

If it happens to shrink to 0 for a single user (i.e. with delete usersStuff[msg.sender] ) but the actual variable hasn't been deleted because usersStuff has data for other users, is there a gas refund?

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Yes, deleting a mapping entry results in a gas refund.

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