On 6/22/2018 2:31 PM, Junio C Hamano wrote:
Derrick Stolee <sto...@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.
      */

Thanks! I was reading Documentation/technical/index-format.txt and optional extensions are mentioned but not described precisely.

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