Make writePrimitive*() and readPrimitive*() methods public.

[aleph-zero]

These utility methods are useful for client code to read/write arrays of
primitive types.

[uboness]

@aleph-zero maybe jumping a bit too late here, but why not just name the methods writeLongArray & readLongArray? as far as I can see we don't have dedicated methods for non-primitive numeric arrays... would make things less verbose

[aleph-zero]

@uboness The read/writePrimitive*Array() methods were used internally by these classes and I thought it better to not go refactoring code that didn't need it.

[uboness]

but that's the point... you're now exposing it to the rest of the system, so renaming the methods now is a small change (later loads of classes will be touching these methods)

[aleph-zero]

Okay @uboness I'll open a new issue and change the names.

[s1monw]

@aleph-zero just change it here? that's just fine a PR is kind of an issue?