You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: types.go
    path of file: ./repos/faasd/vendor/github.com/compose-spec/compose-go/types
    
    the code of the file until where you have to start completion: /*
   Copyright 2020 The Compose Specification Authors.

   Licensed under t
    
func (u *UlimitsConfig) MarshalJSON() ([]byte, error) {
	if u.Single != 0 {
		return json.Marshal(u.Single)
	}
	// Pass as a value to avoid re-entering this method and use the default implementation
	return json.Marshal(*u)
}