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# Parameter holder proxy
 -  returns a parameter holder instance
 -  returns false if the parameter does not exist
 -  returns the default value if parameter does not exist
 -  returns true if the parameter exists
 -  is a proxy method
 -  returns the value of the parameter
 -  is a proxy method
 -  does not return the default value if the parameter exists
 -  is a proxy method
 -  is a proxy method
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