Ran into this while checking structured clone support.

const view = new DataView(new ArrayBuffer(4));
structuredClone(view);

Current result:

TypeError: Data views are not supported yet.

This comes from core/runtime/src/store/from.rs, and it affects both structuredClone() and postMessage() since both go through JsValueStore::try_from_js(...).

This also looks like unfinished support rather than an intentional gap:

• JsValueStore already has a ValueStoreInner::DataView variant in core/runtime/src/store/mod.rs
• core/runtime/src/store/to.rs already has a DataView reconstruction path

There is direct WPT coverage for cloning DataView values in:

• tests_wpt/html/webappapis/structured-clone/structured-clone-battery-of-tests.js
• tests_wpt/html/webappapis/structured-clone/structured-clone-battery-of-tests-with-transferables.js

So the main issue here is just that Boa rejects DataView values outright right now.