Procs

proc isYaml(input: string): bool {....raises: [], tags: [RootEffect], forbids: [].}

Determine if given input is valid YAML. A plain scalar (e.g. "hello") counts as valid YAML.

proc isYamlStream(input: string): bool {....raises: [], tags: [RootEffect],
    forbids: [].}

Determine if given input is a valid multi-document YAML stream. Every document between --- markers is validated on its own.