@Override
    protected void onDeserialize(Deserializer buf) {
        super.onDeserialize(buf);
        waitTime = buf.getDouble(null);
        byte tmp = buf.getByte(null);
        busyWait = (tmp != 0);
    }
Constructs an instance of this class with given argument and wait parameters.

@param arg      The argument for this function.
@param waitTime The time to wait before executing expression.
@param busyWait true if busy wait, false if not.
searchlib/src/main/java/com/yahoo/searchlib/expression/DebugWaitFunctionNode.java