class Redis::Pipeline

def call(*args)

array argument. Check its size for backwards compat.
Starting with 2.2.1, assume that this method is called with a single 
def call(*args)
  if args.first.is_a?(Array) && args.size == 1
    command = args.first
  else
    command = args
  end
  @commands << command
  nil
end

def call_pipelined(commands, options = {}) 

def call_pipelined(commands, options = {})
  @commands.concat commands
  nil
end

def call_without_reply(command)

backwards compat here, since it was introduced in 2.2.2.
Assume that this method is called with a single array argument. No 
def call_without_reply(command)
  @commands.push command
  nil
end

def initialize 

def initialize
  @commands = []
end