When you change this to true, you may need to add more tests.
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should merge the hash in to the parent.
* test/psych/test_merge_keys.rb: test for change. Fixes GH #202
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should not be treated as merge keys.
* ext/psych/lib/psych/visitors/yaml_tree.rb: hashes with keys
containing "<<" should roundtrip.
* test/psych/test_merge_keys.rb: test for change. Fixes GH #203
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contain something besides a hash should be left in tact.
* test/psych/test_merge_keys.rb: test for change
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* ext/psych/lib/psych/visitors/to_ruby.rb: raise an exception when
deserializing an alias that does not exist.
* test/psych/test_merge_keys.rb: corresponding test.
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when multiple merge keys are specified.
* test/psych/test_merge_keys.rb: tests for multi-merge key support
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part of YAML 1.1, so they should be supported. Remove warning and
merge keys to parent. [ruby-core:34679]
* test/psych/test_merge_keys.rb: test for merge keys
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