We have removed unique implicit typing rules and have updated these rules to align them with JSON's productions. In this version of YAML, boolean values may be serialized as “true” or “false”;
You can use !!bool to parse them, though.
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Thank you! According to the YAML 1.2 specification document 'yes' and 'no' are no longer interpreted as boolean.
You can use !!bool to parse them, though.