Export decode_vec_with_len

[mrcnski]

This is necessary to fix the custom impl Decode for BoundedVec. Currently when decoding, it will allocate before doing a length check. See:

paritytech/polkadot#6603 (comment)

You want to ensure that you don't even start try decoding/allocating when the length of the vector is more than the
allowed maximum.

You first decode length of the vector and then early reject if that is too long.

[bkchr]

@mrcnski you also need to bump the patch version and then release this version!

[mrcnski]

@bkchr I'll need some help with that. Should the version bump be a separate PR? How do I release it? (I don't think I have access rights, or do I?)

[bkchr]

You can bump the patch version in this pr. Then merge it. Then do cargo publish. Then go on github and create some new release. I can create the github release for you if you don't know how to.

[mrcnski]

Okay! Technically though, shouldn't this be a minor version bump as we are adding to the public API?

[bkchr]

Technically though, shouldn't this be a minor version bump as we are adding to the public API?

Why not? We don't break anything? I mean we can also bump the minor version 🤷

[mrcnski]

@bkchr The major version is > 0 so a minor version bump doesn't denote a breaking change, it just means that functionality was added.

[bkchr]

@bkchr The major version is > 0 so a minor version bump doesn't denote a breaking change, it just means that functionality was added.

I know.

I read again semver:

MINOR version when you add functionality in a backwards compatible manner
PATCH version when you make backwards compatible bug fixes

Let's bump the minor. I general before I meant that you can do whatever you want :D I would not have blocked you on bumping the minor :D

[mrcnski]

Cool, I was able to cargo publish -- didn't know I could do that. Raised a new release as well!