Package mapdecode implements a generic interface{} decoder. It allows implementing custom YAML/JSON decoding logic only once. Instead of implementing the same UnmarshalYAML and UnmarshalJSON twice, you can implement Decode once, parse the YAML/JSON input into a map[string]interface{} and decode it using this package. This also makes it possible to implement custom markup parsing and deserialization strategies that get decoded into a user-provided struct.