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Summary
Prevent BCD authors from creating new web-features tags (i.e., BCD uses web-features IDs as an allowlist for tags)
Test results and supporting details
Updated test files so that
'web-features:foo'
fails and'web-features:javascript'
passes.Related issues
@ddbeck, Kadir and I talked about the entire workflow yesterday and while want BCD authors to use and apply existing web-feature IDs to BCD features (useful for when BCD features are renamed, or when existing features get additions), we want to prevent that entirely new feature IDs are created in BCD. Instead they should be created in web-features.
For more details, see web-platform-dx/web-features#1672 (comment)