It happens when applying ignite.binary().toBinary(m) to a TreeMap<K, V> with a custom key K.
I thought this would be a nice task to pick as a first (attempt of a) contribution, however there is a ticket for this already assigned to someone: https://issues.apache.org/jira/browse/IGNITE-2852 I haven't seen much activity on it though. Would it be possible for me to pick it? Thanks Jens
