Adding a ByteSlices() method to StringSliceCmd

[iamd3vil]

StringSliceCmd.Result() returns a []string. There can be a ByteSlices() method just like how StringCmd has a Bytes() method. Our use case is that we pull lot of items from redis and write them to an io.Writer. Having byte slices returned will improve performance and reduces allocations. I will send a PR if this is accepted.

cc: @knadh

[knadh]

+1 for func (cmd *StringSliceCmd) ByteSlices(). It can use the same underlying utils.StringToBytes().

@vmihailenco what do you think?

[vmihailenco]

I am not sure about this. This looks like a micro-optimization and if you think it is worth it you can do even better without allocating a [][]byte for ByteSlices. Just copy the StringToBytes to your project:

for _, s := range ss {
    w.Write(StringToBytes(s))
}

When you start thinking about such optimizations you will end up with having StringToBytes anyway.