Const generics implementation

[est31]

It seems that serde has a [T; 0] optimization that we most likely won't be able to support in the initial stable version of const generics, so it's possible that this crate will be needed for longer, especially during early availability of const generics on stable. Thus we should think about adding a trait implemented for all array sizes using const generics to this crate eventually. For now, we should do an experiment.

[est31]

There is a hack available to make the [T; 0] implementation work: rust-lang/rust#61383

[est31]

See 9ece314 .

[est31]

See ce075a7

[est31]

It compiles now, very nice. See 0cbd7f3

So it's usable on nightly Rust right now on serde-big-array master as well as on the 0.2.0 crates.io release. I keep the issue open only to track stabilization of const generics upstream so that I don't forget to remove the feature gates once it stabilizes.

[est31]

Feature gate got removed by a05c0fb . Users of rust 1.51.0 and beyond can use 0.3.1 and beyond. In the 0.4.x branch, my plan is to enable const-generics by default.