class FakeRedis::ZSet

def _floatify(str, increment = true)
  if (( inf = str.to_s.match(/^([+-])?inf/i) ))
    (inf[1] == "-" ? -1.0 : 1.0) / 0.0
  elsif (( number = str.to_s.match(/^\((-?\d+)/i) ))
    number[1].to_i + (increment ? 1 : -1)
  else
    Float str.to_s
  end
rescue ArgumentError
  raise Redis::CommandError, "ERR value is not a valid float"
end