Batteries has a Cap submodule that provides type-level protection for
arrays so they can be Read-only/Write-only/Read-write.  The same idea with
a variance annotation and just read-only access seems to be what you're
looking for, no?

2012/3/14 Lukasz Stafiniak <lukstafi@gmail.com>

> Hi,
>
> Does anyone have a Tuple module that exports arrays as immutable and
> covariant?
>
> Thanks,
> Łukasz
>
>
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