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Depth rest API change and orderbook rpc API change: add a new flag pending_match.
The pending_match flag in the response is to indicate below orderbook status: there are new orders created in current block, but the matching process has not started for the block, then pending_math=true. As a result, there could be orders with cross prices - price of ask is lower than price of bid. Client can ignore the response with pending_match=true and query the depth API until pending_match=false.