I read all thread and conclude that developers want a one button - 'do all what I need'.

As mentioned above, for example, python have a arbitrary int (that implemented as C library ;)).

C can be used on many platforms. For each platform developer have solution as library. Right way is creating something new instead cutting something that exist.

Each platform have a own limitations: memory, execution time etc.
It's good if different platforms can communicate between each other.

Not all algorithms consume a lots of memory or have needs in arbitrary int.

In some cases we have + or -. Good/right way is "-" -> library solution -> "+" .
Language features are fundamental features.

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