only skip hash keys sorting for actually tied hashes #42
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As of version 2.25, JSON::XS announced that it won't sort tied hashes under the 'canonical' option. But it's implementation covered too broad range of magic - SvRMAGICAL is set for any magic other then mg_get/mg_set upon cast.
It was discovered in the garu/Data-Printer#75 issue that the core module Hash::Util::FieldHash can easily produce hashes that won't be sorted by JSON::XS::encode_json despite being not tie'd.