Unable to make search query with group by, with the error: json: cannot unmarshal number into Go struct field SearchGroupedHit.grouped_hits.group_key of type map[string]interface {}

Description

When I make a search query with group by, I get the error

json: cannot unmarshal number into Go struct field SearchGroupedHit.grouped_hits.group_key of type map[string]interface {}

Steps to reproduce

	filterString := fmt.Sprintf("productSlug:=%s", productSlug)
	searchParams := &api.SearchCollectionParams{
		Q:          "*",
		QueryBy:    "searchText0,searchText1,searchText2",
		FilterBy:   &filterString,
		GroupBy:    utils.Ref("productID"), // utils.Ref just gets a pointer
		GroupLimit: utils.Ref(1),
	}
	resp, err := tsClient.Collection(collection).Documents().Search(searchParams)

And here's the schema

{
  "name": "product_variants_all",
  "fields": [    
    {
      "name": "searchText0",
      "type": "string",
      "facet": false,
      "optional": false,
      "index": true,
      "sort": false,
      "infix": false,
      "locale": ""
    },
    {
      "name": "productSlug",
      "type": "string",
      "facet": false,
      "optional": false,
      "index": true,
      "sort": false,
      "infix": false,
      "locale": ""
    },
    {
      "name": "searchText1",
      "type": "string",
      "facet": false,
      "optional": false,
      "index": true,
      "sort": false,
      "infix": false,
      "locale": ""
    },
    {
      "name": "searchText2",
      "type": "string",
      "facet": false,
      "optional": false,
      "index": true,
      "sort": false,
      "infix": false,
      "locale": ""
    },
    {
      "name": "rankingScore",
      "type": "float",
      "facet": false,
      "optional": false,
      "index": true,
      "sort": true,
      "infix": false,
      "locale": ""
    },
    {
      "name": "productID",
      "type": "int32",
      "facet": true,
      "optional": false,
      "index": true,
      "sort": true,
      "infix": false,
      "locale": ""
    }
  ],
  "default_sorting_field": "rankingScore",
  "enable_nested_fields": true,
  "symbols_to_index": [],
  "token_separators": []
}

Expected Behavior

No error

Actual Behavior

Unmarshal error

Metadata

Typesense Version: 0.24.1

OS: Ubuntu 22.04

Start at the SearchCollectionParams and Documents().Search entry points, then inspect how SearchGroupedHit.grouped_hits.group_key is decoded. Reproduce the grouped search using the schema and Go example, and verify that a numeric productID group key completes without an unmarshal error and is returned correctly.