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Remove unicode character encoding from ActiveSupport::JSON.encode
The encoding scheme (e.g. ☠ -> "\u2620") was broken for characters not in the Basic Multilingual Plane. It is possible to escape them for json using the weird encoding scheme of a twelve-character sequence representing the UTF-16 surrogate pair (e.g. '𠜎' -> "\u270e\u263a") but this wasn't properly handled in the escaping code. Since raw UTF-8 is allowed in json, it was decided to simply pass through the raw bytes rather than attempt to escape them.
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