deep_merge(other_hash) public

Returns a new hash with self and other_hash merged recursively.

h1 = {:x => {:y => [4,5,6]}, :z => [7,8,9]}
h2 = {:x => {:y => [7,8,9]}, :z => "xyz"}

h1.deep_merge(h2) #=> { :x => {:y => [7, 8, 9]}, :z => "xyz" }
h2.deep_merge(h1) #=> { :x => {:y => [4, 5, 6]}, :z => [7, 8, 9] }
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