Add missing Uint8Array.setFromHex extern.

[KimlikDAO-bot]

Supplements 64b6c77

[niloc132]

Thanks for catching this!

[KimlikDAO-bot]

Apologies for the non-compiling PR. Here's what happened:

Each declaration type in gcc has one identity dimension [@constructor, @interface, @record] and one shape dimension [@struct, @unrestricted, @dict].

For better optimization, @interface's are preferred over @record's, but they can be more unergonomic when constructing the object. For return value like this, this issue doesn't occur and @interface's basically have no downside; you can still destructure out of interfaces without a cast:

const { written, read } = myUint8Array.setFromHex("FF");

By default, @interface's declared in this older constructor / prototype pattern have the @unrestricted shape. That's why we explicitly mark it as a @struct, which means you cannot do res["written"] but have to access the properties like res.written.

So to summarize, the ideal identity and shape for this return type appears to be @interface @struct, which is what this CL does.

[lauraharker]

Thanks for the fix!

Merged in a9579d2