getNsfw on Subreddit always returns null

[svby]

I'm trying to retrieve whether a subreddit is marked as NSFW to be able to remove them from a list (over18 == true), but the value of getNsfw seems to always be null (and consequently, isNsfw returns false.)

fun main(args: Array<String>) {
    val credentials = Credentials.userless(clientId, clientSecret, uuid)
    val client = OAuthHelper.automatic(OkHttpNetworkAdapter(userAgent), credentials)

    val sub = client.subreddit("nsfw").about()
    println(sub.nsfw) // null
    println(sub.isNsfw) // false
}

Testing this with an SFW subreddit (i.e. r/Otters) also results in getNsfw returning null.

Note: Viewing about at r/nsfw/about.json reveals:

which is interesting, since both NSFW flags are annotated with over_18 and not over18.

Edit 2: Just to make sure it wasn't an inconsistency between the OAuth APIs and the user-accessible API, I logged the response body in an interceptor:

val ohClient = OkHttpClient.Builder()
        .addInterceptor {
            val res = it.proceed(it.request())
            res.body()?.source()?.let {
                it.request(Long.MAX_VALUE)
                println(it.buffer().clone().readString(Charsets.UTF_8))
            }
            res
        }
        .build()

client = OAuthHelper.automatic(OkHttpNetworkAdapter(userAgent, ohClient), credentials))

and it seems to be the same.

[mattbdean]

Probably a mistake on my part. Everywhere else in the API over_18 is used.

[mattbdean]

getNsfw() was never supposed to be part of the public API so I've deprecated it.