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# ::get() ::set()
 -  returns the value of key config
 -  takes a default value as its second argument
# ::has()
 -  returns false if the key config does not exist
 -  returns true if the key config exists
# ::add()
 -  adds an array of config parameters
 -  adds an array of config parameters
 -  adds an array of config parameters
# ::getAll()
 -  returns all config parameters
# ::clear()
 -  removes all config parameters
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