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For when you know you are reinventing the wheel, but are doing it anyways. Questions with this tag involve code that is already fully implemented (such as from a library).

It is advised that such questions be free from criticism such as:

Library X already implements this code better; use that instead.

However, if it appears that the author is unaware of a better implementation (thus not writing the code for learning/practice), then he/she should be informed of that. Such questions should not use this tag.