User:Pathoschild/Sandbox
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References with digit-only names fail without error on en-Wikisource but display an error on en-Wikipedia, running MediaWiki 1.44.0-wmf.6 (d77bde6). See this test on en-Wikisource.
<ref name="1">foo</ref> <references />
Cite error: The <ref>
tag name cannot be a simple integer (see the help page).