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The Norway problem in YAML refers to the two-letter ISO country code 'NO' being parsed as boolean false due to implicit typing rules in YAML v1.1 and earlier. YAML v1.2 (released 2009) removed implicit boolean typing, fixing the issue on paper, but popular libraries like PyYAML and LibYAML still haven't adopted v1.2 as of 2026. The post traces the history of YAML spec versions, explains why library adoption is slow given YAML's extreme complexity, surveys the fragmented ecosystem (including Go's go-yaml and Kubernetes' new kyaml dialect), and concludes that while the spec is fixed, most widely-used implementations still exhibit the Norway problem. Quoting strings is a workaround, but the broader takeaway is that the YAML ecosystem is slowly migrating toward stricter v1.2 behavior.

YAML? That’s Norway problem