Merge remote-tracking branch 'origin/multi-mid'

* origin/multi-mid:
  view: show X-Alt-Message-ID in permalink view, too
  index: allow search/lookups on X-Alt-Message-ID
  linkify: support adding "(raw)" link for Message-IDs
  view: improve warning for multiple Message-IDs
  view: move '<' and '>' outside <a>
  view: display redundant headers in permalink
  search: support multiple From/To/Cc/Subject headers

diff --git a/HACKING b/HACKING
index 666d504e7336b61ef7d26f559e5b192c56fbd9de..859745ef3151c642c22623b6ce31327f3f563e67 100644 (file)
--- a/HACKING
+++ b/HACKING
@@ -43,6 +43,11 @@ distribute and verify.  public-inbox itself will only be implemented
 in scripting languages (currently Perl 5) and optional JIT-compiled C
 (via Inline::C)
 
+Do not recurse on user-supplied data.  Neither Perl or C handle
+deep recursion gracefully.  See lib/PublicInbox/SearchThread.pm
+and lib/PublicInbox/MsgIter.pm for examples of non-recursive
+alternatives to previously-recursive algorithms.
+
 Performance should be reasonably good for server administrators, too,
 and we will sacrifice features to achieve predictable performance.
 Encouraging folks to self-host will be easier with lower hardware