I'm upgrading my site to MediaWiki 1.26 (from 1.24) and noticed a change in API behavior. One of our custom API modules:

        http://mywiki.com/w/api.php?action=foobar&format=json......

used to return a JSON array, like this:

        [ {"start":"2015-12-28","end":"2016-01-01", ...} ]

and now it returns a numerically indexed hash like this instead:

        {"0":{"start":"2016-01-18","end":"2016-01-18", ...}}

The API no longer returns root arrays by default, because that's almost always not what's intended (see T12887). If necessary you can override that for your action module with $result->addArrayType( null, 'array' ).

 

Do we need to do something special in 1.26 to get the array instead of the hash? Or is this a breaking change? Or are we probably doing something wrong?  I looked for breaking API changes in 1.25 and 1.26 but don't see anything like this:

        https://www.mediawiki.org/wiki/MediaWiki_1.25#API_changes