Given 5.014 features, is encoding::warnings still needed?

[Lars Dɪᴇᴄᴋᴏᴡ 迪拉斯]

In <http://stackoverflow.com/q/6281049#comment-7334585>, tchrist asks:
| Is `encoding::warnings` actually still needed given the `/dual` modifiers
| and the `unicode_strings` feature?

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