main excludes checked with the defaults' case and fold; Latin-1 decoding memory; hardlink election documented

1 files changed, 4 insertions, 1 deletions

diff --git a/docs/design.md b/docs/design.md
index c9ebe50..ef52d7e 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -279,7 +279,10 @@ by size. Only groups of two or more are hashed: first the first and last
 64 KiB, then SHA-256 of the whole file. Empty files are never duplicates.
 Two names for the same file — the same device and inode, as a hardlink
 creates — are never duplicates of each other; they may still both be
-duplicates of a separate identical file.
+duplicates of a separate identical file. The original is elected once for
+all identical content, so a scanned file whose hardlink under a DIR is
+elected is that original, and not a duplicate, even when the DIR also
+holds a separate copy.
 
 The **original** in each group is, in order of preference: a file under one
 of the given DIRs, then the oldest by mtime, then the shortest name, then