Maybe add method for creating boxed slice

[upsuper]

It might be useful to add method fn default_boxed_slice(n: usize) -> Box<[Self]> if there are such demand.

[bluebear94]

I'd also like a method to create an array, perhaps fn default_boxed_array<const N: usize>() -> Box<[Self; N]>.

[upsuper]

@bluebear94 Thanks for the request. It has been added in 0.1.10.