# File lib/rfuse.rb, line 11
    def self.packxattr(xattrs)
        case xattrs
        when Array
            xattrs.join("\000").concat("\000")
        when String
            #assume already \0 separated list of keys
            xattrs
        else
            raise Error, ":listxattr must return Array or String, got #{xattrs.inspect}"
        end
    end