If the object has the param, then return it. If the param is unknown, create it with the given default value and return the default.
A Yaml object as created by
Query this YAML object for a certain parameter and return its value. If it does not exist it is created with a default value.
Set a YAML parameter to a certain value. Overwrites the old value or creates a new entry if hithero unknown.
Write YAML config (including some documentation) to a YAML file. Returns TRUE on success (always), unless writing the file generates an error.
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