Method packb

java/lib/src/main/java/io/github/ccxt/Exchange.java:2660–2676

(Object data)

    }

    public Object packb(Object data) {
        try (java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
             org.msgpack.core.MessagePacker packer = org.msgpack.core.MessagePack.newDefaultPacker(out)) {
            // Java Maps don't preserve insertion order, but msgpack signatures
            // (e.g. Hyperliquid) require a canonical field order. Match the Go
            // port's strategy (go/v4/exchange_eth.go): per-exchange schemas
            // reorder action dicts before packing. Schemas are looked up by
            // the value of the "type" key and applied recursively (nested
            // orders, builder, trigger spec, etc.).
            Object normalized = applyMsgpackSchema(data, null);
            packValue(packer, normalized);
            packer.flush();
            return out.toByteArray();
        } catch (java.io.IOException e) {
            throw new RuntimeException("packb failed", e);
        }
    }

    // A msgpack schema declares the canonical field order for a Map value
    // and, for fields whose value is itself a Map or a List of Maps, an