Version 3.2.2: in-memory replacements fill their slots exactly (padded ones played as silence)

docs/decisions.md

@@ -65,8 +65,11 @@ tables): high risk for little gain, not done.
 - **Model:** one catalog row per Wwise media ID (archive `BANK`, target = media ID), not per bank: the same
   media is stored in up to dozens of bank copies (banks are cooked into every package that uses them), and the
   game may load any of them. A replacement is written into **every** copy (`BANK_locations.csv.gz`).
-- **In place:** each copy keeps its size (zero-padded, like WAD speech); DIDX/HIRC offsets and the package
-  layout never change, so nothing else in the engine data has to be rewritten.
+- **In place:** each copy keeps its size; DIDX/HIRC offsets and the package layout never change, so nothing
+  else in the engine data has to be rewritten. Unlike WAD speech, an in-memory copy is never zero-padded:
+  the replacement fills its slot exactly with a label list chunk (the game plays a padded in-memory WEM as
+  silence; `docs/formats/banks.md`). Shrinking the declared sizes (DIDX and every Sound object's in-memory
+  size) would also work, but needs every HIRC source of the media in every bank copy located and rewritten.
 - **Packages:** ackit reads the LZO packages itself (pure Python, ~47 MB/s, block-level access) and writes
   only the changed 128 KiB blocks, stored as a single LZO literal run (valid LZO1X without matches), then
   fixes the chunk table. No compressor and no external tool are needed; untouched blocks stay byte-identical.