Unverified50% confidenceFactExact time
The YAML specification requires keys in a mapping to be unique, but does not mandate that parsers raise an error on duplicate keys; mainstream implementations such as PyYAML default to a 'last one wins' strategy, keeping the final value without producing a warning.
1
Sources
50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
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