* improve performance and avoid head-of-line blocking on slow storage
(done for most git blob retrievals, Xapian needs work)
+* allow optional use of separate Xapian worker process to implement
+ timeouts and avoid head-of-line blocking problems. Consider
+ just-ahead-of-time builds to take advantage of custom date parsers
+ (approxidate) and other features not available to Perl bindings.
+
+* integrate git approxidate parsing into Xapian w/o spawning git
+
* HTTP(S) search API (likely JMAP, but GraphQL could be an option)
It should support git-specific prefixes (dfpre:, dfpost:, dfn:, etc)
as extensions. If JMAP, it should have HTTP(S) analogues to