Golang: Use string.join on a type alias for a string
<p>I have a type alias for string like </p>

<p>type SpecialScopes string</p>

<p>and I want to Join an array of this type using the strings.Join function</p>

<pre><code>func MergeScopes(scopes ...SpecialScopes) SpecialScopes {
    return strings.Join(scopes, ",")
}
</code></pre>

<p>But with the above I get the errors</p>

<pre><code>cannot use scopes (type []SpecialScopes) as type []string in argument to strings.Join
cannot use strings.Join(scopes, ",") (type string) as type SpecialScopes in return argument
</code></pre>

<p>Is there a way to make golang realize that SpecialScopes is just another name for strings and do the join function on it?
If not what is the most efficient way to go about doing this? One way I see is to cast all the elements in the array to string, join, then cast it back to SpecialScopes and return the value</p>

<p>Update 1:
I have a working implementation that casts the values. Any suggestions for a faster way to do this?</p>

<pre><code>func MergeScopes(scopes ...SpecialScopes) SpecialScopes {
    var s []string
    for _, scope := range scopes {
        s = append(s, string(scope))
    }

    return SpecialScopes(strings.Join(s, ","))
}
</code></pre>