Re: [PATCH 09/23] midx: write pack names in chunk

> Derrick Stolee <stolee@gmail.com> writes:
>
>> The index extension documentation doesn't appear to be clear about
>> which extensions are optional or required, but it seems the
>> split-index is the only "required" one and uses lowercase for its
>> extension id.
> read-cache.c::
>
>      /* Index extensions.
>       *
>       * The first letter should be 'A'..'Z' for extensions that are not
>       * necessary for a correct operation (i.e. optimization data).
>       * When new extensions are added that _needs_ to be understood in
>       * order to correctly interpret the index file, pick character that
>       * is outside the range, to cause the reader to abort.
>       */