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### Added
* Added the `maxAge` attribute to the `CookieInit` dictionary in `web-sys`,
matching the current Cookie Store API specification.
[#5169](https://github.com/wasm-bindgen/wasm-bindgen/pull/5169)
* The js-sys futures codegen opt-in can now also be enabled via the
`WASM_BINDGEN_USE_JS_SYS=1` environment variable, in addition to
`--cfg=wasm_bindgen_use_js_sys`. This works on stable when `--target`
is in use, where Cargo does not propagate the cfg to host proc-macros.
[#5164](https://github.com/wasm-bindgen/wasm-bindgen/pull/5164)
### Changed
* `JsOption<T>` now treats only `undefined` as empty, aligning it with
TypeScript's strict `T | undefined` semantics and with `Option<T>`'s wire
shape (`None` ↔ `undefined`). Previously `is_empty`, `as_option`,
`into_option`, `unwrap`, `expect`, `unwrap_or_default`, and
`unwrap_or_else` treated both `null` and `undefined` as absent; JS `null`
is now a distinct present value. The `impl<T> UpcastFrom<Null> for
JsOption<T>` is removed (`Undefined` still models absence), and the
`Debug`/`Display` absent placeholder changed from `"null"` to
`"undefined"`. Code relying on `null → None` should return `undefined`
from the JS side, or check explicitly with
`val.as_option().filter(|v| !v.is_null())`.
[#5170](https://github.com/wasm-bindgen/wasm-bindgen/pull/5170)
### Fixed
* Removed invalid `js_sys::Array<T>` to `js_sys::ArrayTuple<(...)>` upcasts.
`ArrayTuple` encodes a fixed tuple arity, while a plain JavaScript array does
not prove that arity statically.
* Fixed incorrect variance in `&mut` reference upcasting. `&mut T` upcasts
were covariant in the pointee, so a `&mut T` could be widened to a `&mut`
of a supertype and used to write back a value the original type would not
accept, leaving a reference whose static type no longer matches the value
it points to. Mutable references are now *invariant* in their pointee:
`&mut T` only upcasts to `&mut Target` when both `Target: UpcastFrom<T>`
and `T: UpcastFrom<Target>` hold. This rejects the invalid widening but is
a breaking change for callers that relied on widening `&mut` references.
[#5176](https://github.com/wasm-bindgen/wasm-bindgen/issues/5176)
* Fixed WASI targets (`wasm32-wasip1`/`wasm32-wasip2`) emitting unresolved
`__wbindgen_placeholder__` imports, which broke component linking. The
codegen and runtime gates now exclude `target_os = "wasi"` (restoring the
pre-0.2.115 stub behavior), including the `panic = "unwind"` paths in
`wasm-bindgen-futures`.
[#5175](https://github.com/wasm-bindgen/wasm-bindgen/pull/5175)
* Fixed a panic ("Unhandled load width 8") in the descriptor interpreter when
processing `-Cinstrument-coverage`-instrumented modules, unblocking
`cargo llvm-cov --target wasm32-unknown-unknown` for crates whose describe
helpers get instrumented.
[#5179](https://github.com/wasm-bindgen/wasm-bindgen/pull/5179)
* Fixed `main` silently never running on wasm64 for bin crates.
[#5181](https://github.com/wasm-bindgen/wasm-bindgen/pull/5181)
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botbotdependenciesPull requests that update a dependency file
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