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I cannot confirm the overwriting behaviour for conflicting keys in merged hashes.
When I try to merge two hashes, and one key is the same with another value, the old key in the original hash is not overwritten with the newest version of the key.
The old key remains, but changes the position.
I have Ruby 1.93p484 (2013-11-22 revision 43786) on Ubuntu Linux 14.4. Is my old Ruby version the explanation for the different behavior?