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go - How to Unmarshal an inconsistent JSON field that can be a string *or* an array of string?

I am having trouble Unmarshalling some Json I don't have control over. There is one field that 99% of the time is a string but occasionally is an array.

type MyListItem struct {
    Date  string `json:"date"`
    DisplayName       string `json:"display_name"`
}

type MyListings struct {
    CLItems []MyListItem `json:"myitems"`
}

var mylist MyListings
err = json.Unmarshal(jsn, &mylist)
if err != nil {
    fmt.Print("JSON:
%s
 error:%v
", string(jsn),err)
    return
}

Json is as follows:

{       
    "date": "30 Apr",
    "display_name": "Mr Smith"
},
{
    "date": "30 Apr",
    "display_name": ["Mr Smith", "Mr Jones"],
}

error: json: cannot unmarshal array into Go struct field MyListItem.display_name of type string

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