Can you not just localise the entire AoH?: 

{ 
    local @data; 
    $data[ $_ ]{unit} = 'something' for 0 .. $#data; 
    ... 
} 
# all changes undone here

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In reply to Re: Localizing hash keys in an AoH by BrowserUk
in thread Localizing hash keys in an AoH by kennethk

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