Does a feature for checking optional defined keys exist?

[saveriogzz]

hello folks!

Really like this project and i would like it to use to build a custom yaml checker. Is there already a feature to make sure that also keys defined as Optional, when misspelled, are correctly caught?

Here is the reproducible issues I'm running into:

//> using scala 3.3.1
//> using dep org.virtuslab::scala-yaml:0.3.0

import org.virtuslab.yaml.*

case class Config(
  required: String,
  optional: Option[String]
) derives YamlCodec

@main def demo(): Unit = {
  // YAML with misspelled optional field "optinal" instead of "optional"
  val yaml = """
    |required: hello
    |optinal: world
    |""".stripMargin

  yaml.as[Config] match {
    case Right(config) =>
      println(s"✅ Decoded: $config")
      println(s"   optional = ${config.optional}")
      println("⚠️  Misspelled 'optinal' was silently ignored!")
    case Left(error) =>
      println(s"❌ Error: ${error.msg}")
  }
}

here optional is misspelled but the program still validates it and it silently hide the error.

Thank you for your help!