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Six places read the Supported Book Formats and Supported Audiobook Formats settings on their own: post-processing, the post-process scan, IRC, slskd, Prowlarr and direct download. For ebooks they already agreed, since they all fall back to `DEFAULT_EBOOK_FORMATS`. For audiobooks they did not. The settings registry and slskd fall back to every audio format plus zip and rar, while post-processing and IRC fell back to m4b and mp3 only. They now share `shelfmark/core/formats.py`, with `get_supported_formats`, `get_supported_audiobook_formats` and a content-type aware `get_supported_formats_for`, and a shared `DEFAULT_AUDIOBOOK_FORMATS` in `core/utils.py` next to the ebook one. `policy.py` re-exports the same functions, so nothing that imports them from there changes. It is not in `policy.py` itself because importing the `postprocess` package pulls in the router, which imports the release sources, so a source could not import from it without a cycle. One behaviour difference, and only in the fallback: with the audiobook setting unset, or emptied, post-processing and IRC used to accept m4b and mp3 and now accept the full default list like slskd and the settings page already did. A configured list is read exactly as before. Direct download's own helper used the raw configured list and now reads the same normalized one, which is identical for any list the settings page can save. Also public now: `parse_size` in the Prowlarr source (slskd and Newznab imported it with the underscore) and `coerce_completed_path_timeout_seconds` in the client base handler (slskd imported that too). Not changed on purpose: slskd's `_coerce_int` looks like a copy of `coerce_int` but is not. It reads `"12.0"` as 12 and `True` as 0, where `coerce_int` gives 0 and 1. And the `_parse_size` in the IRC source is a different function, string to bytes. Tests: a new set checks that post-processing, IRC and slskd all fall back to the shared defaults and that the settings default is the shared one, and the scan-archive and IRC tests now patch the shared config instead of the per-module copies. Full suite passes.