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class Hash
# Returns a new hash with +self+ and +other_hash+ merged recursively.
def deep_merge(other_hash)
dup.deep_merge!(other_hash)
end
# Returns a new hash with +self+ and +other_hash+ merged recursively.
# Modifies the receiver in place.
def deep_merge!(other_hash)
other_hash.each_pair do |k,v|
tv = self[k]
self[k] = tv.is_a?(Hash) && v.is_a?(Hash) ? tv.deep_merge(v) : v
end
self
end
end
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