The appendExtensionData/appendJsVars mechanism in ParserOutput needs a "counter" "sum" strategy which sums integers in order to handle usage counts, such as the one desired by Wikidata in the parent task.
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Event Timeline
Change #1184525 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/services/parsoid@master] Add MergeStrategy enumeration
Change #1184525 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Add MergeStrategy enumeration
Change #1184133 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/core@master] Add enumeration for ParserOutput merge strategy from Parsoid
Change #1184148 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/core@master] ParserOutput: Implement MergeStrategy::COUNTER
Change #1184779 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/services/parsoid@master] Add MergeStrategy::COUNTER support to StubMetadataCollector
Change #1184780 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/services/parsoid@master] Switch ContentMetadataCollector strategy to an enumeration
Change #1184779 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Add MergeStrategy::COUNTER support to StubMetadataCollector
Change #1185118 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a20
Change #1185118 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a20
Change #1185290 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/services/parsoid@master] Rename MergeStrategy::COUNTER to MergeStrategy::SUM
Change #1184133 merged by jenkins-bot:
[mediawiki/core@master] Add enumeration for ParserOutput merge strategy from Parsoid
Change #1185290 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Rename MergeStrategy::COUNTER to MergeStrategy::SUM
Change #1187841 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a21
Change #1187841 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a21
Change #1184780 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Switch ContentMetadataCollector strategy to an enumeration
Change #1188397 had a related patch set uploaded (by OSleger; author: OSleger):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a22
Change #1188397 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.22.0-a22
Change #1184148 merged by jenkins-bot:
[mediawiki/core@master] ParserOutput: Implement MergeStrategy::SUM