Add changenotes for PRs #9305 and #9337

editions/tw5.com/tiddlers/releasenotes/5.4.0/#9305.tid

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+title: $:/changenotes/5.4.0/#9305
+description: Let tiddler modules overwrite shadow modules with the same exports but different names
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: bugfix
+change-category: internal
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9305
+github-contributors: yaisog
+
+Tiddlers were previously processed before shadows during module registration. The shadow modules registration algorithm only checked for a matching title to prevent overwriting, but a differently named tiddler with the same exports would be overwritten by a shadow. This change swaps the order of $tw.wiki.defineTiddlerModules() and $tw.wiki.defineShadowModules() in boot.js, so that tiddlers are processed after shadows and can therefore override them.
+
+Each group (tiddlers or shadows) is sorted alphabetically, so plugin shadows would previously correctly overwrite core shadows (assuming their name starts with $:/plugins/), which remains unchanged. This change only affects module tiddlers that have the same export as a shadow, but a different name.
+

editions/tw5.com/tiddlers/releasenotes/5.4.0/#9337.tid

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+title: $:/changenotes/5.4.0/#9337
+description: Modify output of some math operators for empty inputs
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: bugfix
+change-category: filters
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9337
+github-contributors: yaisog
+
+The following math operators are changed to output an empty list when the input list is empty:
+
+* sum[]
+* product[]
+* maxall[]
+* minall[]
+* average[]
+* variance[]
+* standard-deviation[]

editions/tw5.com/tiddlers/releasenotes/5.4.0/#9337/compatibility-break/math-filters

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+title$:/changenotes/5.4.0/#9337/compatibility-break/math-filters
+changenote: $:/changenotes/5.4.0/#9337
+created - 20251112152513384
+modified - 20251112152513384
+tags: $:/tags/ImpactNote
+description: filter output with empty input changes for some math filter operators
+impact-type: compatibility-break
+
+These math operators will now output an empty list when the input list is empty:
+
+* sum[] - previously returned 0
+* product[] - previously returned 1
+* maxall[] - previously returned -Infinity
+* minall[] - previously returned Infinity
+* average[] - previously returned NaN
+* variance[] - previously returned NaN
+* standard-deviation[] - previously returned NaN