> @@ -105,4 +183,62 @@ protected Payload copyMetadataAndSetLength(Payload 
> input, Payload returnVal, lon
>        return returnVal;
>     }
>  
> +   @Override
> +   public Iterable<Payload> slice(Payload input, long size) {
> +      checkNotNull(input);
> +      checkArgument(size >= 0, "length is negative");
> +
> +      ContentMetadata meta = 
> BaseMutableContentMetadata.fromContentMetadata(input.getContentMetadata())
> +                                                       .toBuilder()
> +                                                       .contentLength(size)
> +                                                       .contentMD5(null)

> Is this required?

There has been just enough time pass between now and when I originally did this 
for me to be a little hazy about what I intended.  `meta` is passed through to 
the iterator, which uses it to a) extract the overall size, and b) as a 
template for creating the individual metadata instances; How do you think this 
should be done?

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