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class Hash
def merge!(other, &block)
raise "can't convert argument into Hash" unless other.respond_to?(:to_hash)
if block
other.each_key{|k|
self[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
}
else
other.each_key{|k| self[k] = other[k]}
end
self
end
end
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