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Revert "Create pr-draft.md"

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This reverts commit dd116af41b.
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Jeremy Ruston
2026-02-08 21:49:45 +00:00
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## Summary
Fixes #9471: Multi-valued variables (MVVs) introduced in #8972 lose their multi-valued nature when passed as procedure/function parameters through `$transclude` because `<<var>>` resolves to the first value only (for backwards compatibility).
There has been a lot of discussion about these issues. Working through them has reversed my opinion on some points. In particular, it introduces the `((var))` syntax as the MVV counterpart to `<<var>>`, mirroring the existing relationship in filter operands where `<var>` returns a single value and `(var)` returns all values.
## New syntax
* `((var))` as widget attribute: Passes all values of the MVV to the procedure/function parameter
* `((var))` as inline wikitext: Displays all MVV values joined with `, ` (default separator)
* `((var\|\|sep))` as inline wikitext: Displays all MVV values joined with custom separator
* `(((filter)))` as inline wikitext: Displays filter results joined with `, ` (default separator)
* `(((filter\|\|sep)))` as inline wikitext: Displays filter results joined with custom separator
* `((var))` as parameter default: e.g. `\procedure show(items:((defaults)))` — default value is the MVV