Deprecated is standards-speak for "you can use this for now, but it is on its way out."

It is a way of balancing the practicalities of today's implementations with the needs of the future.

You should not use this in any future implementations.

Deprecated means that it is still in use, but only for historical purposes and it will be removed probably in the next big release. It is recommended that you do not use Deprecated functions or features - even if they are present in the current library for example.

Obsolete or OBSOLETE means that is already out-of-use.

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