Summary

I'm trying to unmarshal some document received from mongo into a struct. This struct has a member that is a map[string]interface but with an alias (type metadata map[string]interface{} {}in the example below). This map can contains any data, including other map[string]interface{}{}.

When unmarshalling the document, it's correctly parsing this member as type metadata, but it's also converting map that are included in the map as this the type metadata. I think it should be map[string]interface instead.

Please provide the version of the driver. If applicable, please provide the MongoDB server version and topology (standalone, replica set, or sharded cluster).

1.9.1

How to Reproduce

https://go.dev/play/p/baefmEyupxI 

Unmarshal as 

{{main.data{Metadata:main.metadata{"foo":main.metadata

}}}}

But expected as 

{{main.data{Metadata:main.metadata{"foo":map[string]interface {}

}}}}
 

Additional Background

Please provide any additional background information that may be helpful in diagnosing the bug.