fetch( keystr, ifnone = nil ) public

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# File lib/yaml/dbm.rb, line 17
    def fetch( keystr, ifnone = nil )
        begin
            val = super( keystr )
            return YAML.load( val ) if String === val
        rescue IndexError
        end
        if block_given?
            yield keystr
        else
            ifnone
        end
    end
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