Hi all, PR #2949 (https://github.com/apache/groovy/pull/2949) moves groovy-yaml, groovy-toml and groovy-csv to Jackson 3. Paul asked that one consequence be raised here rather than land quietly.
Jackson 3's YAML parser resolves unquoted values by the JSON schema, and the resolver can't be configured. Only lowercase true, false and null and plain decimal numbers take a type. yes/no/on/off, True/FALSE, Null, ~ and 0x1F/017 now arrive as strings, where Groovy 6 read them as booleans, null or integers. The case most likely to bite: "enabled: off" read with YamlSlurper.parseText now gives the String 'off', which is truthy, with no error. The typed parseAs/parseTextAs API rejects it for a boolean property instead. The PR documents this as a 7.0 breaking change and has a test that pins it. The YAML guide shows how to load with SnakeYAML directly for documents that need YAML 1.1 typing. Comments welcome, especially if anyone thinks it shouldn't ship as is. Scott
