Hi. I'm learning Rust these days and have a (maybe stupid) question:
Where are the primitive types (isize, bool, ...) originally defined, in core or std lib?
In the docs it looks like they are implemented twice, but I think one library uses the implementation of the other. So: Which library should better be used e. g. for associated methods and constants like isize::MAX?
An what means the note "Deprecation planned" by the primitives in std?

Thanks for help!

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