String types should not be silently converted to Integer or Boolean

[winitzki]

If a Yaml value is a String but the actual value appears to be parsable as integer or boolean, scala-yaml automatically translates it into java.lang.Integer and java.lang.Boolean. This changes the yaml schema silently and unexpectedly. With typical kubernetes Yaml where values such as "2" or "true" are of type String , the Yaml cannot be parsed after scala-yaml serializes the data.

Example code:

    val yaml1 = """  revision: "2"  """.as[Any].toOption.get
   // We expect `revision` to be of type `String` and value `"2"`, instead have an integer:
    assert(yaml1.asInstanceOf[Map[String, Any]].apply("revision").isInstanceOf[java.lang.Integer])

    val yaml2 = """  enabled: "true"  """.as[Any].toOption.get
   // We expect `enabled` to be of type `String` and value `"true"`, instead have a Boolean:
    assert(yaml2.asInstanceOf[Map[String, Any]].apply("enabled").isInstanceOf[java.lang.Boolean])

I expected it to be a String in each case, since "2" and "true" are just strings.

Not sure if this is a feature that can be turned off, please advise.