What's "walletconflicts" in listtransactions method output Here's an output of listtransactions method 

[
{
"account" : "",
"address" : "mz2A28GQxWrYgMn2z9pRqaUFNqTMyhk1sJ",
"category" : "receive",
"amount" : 6.30000000,
"confirmations" : 157,
"blockhash" : "00000000befa3ef184f6c3cdec8814b945bad9e3f7ce9eb38e3102bcf4c030c0",
"blockindex" : 9,
"blocktime" : 1397675516,
"txid" : "f517350f088d235878ecab8d5241f0b6e59a4081eec22031c449d0d01d79ed66",
"walletconflicts" : [
],
"time" : 1397672026,
"timereceived" : 1397672026
}
]


what's walletconflicts, it's array of what ? transaction ids, maybe ? i couldn't find any documentation even in Bitcoin console.
This is new. It is a field, which contains txids which hold the same data as the original transaction (but has different txids).

See ID-malleation bug