# MobX 6.7.0

- Product: MobX (https://whatsnew.fyi/product/mobx)
- Vendor: MobX
- Date: 2022-11-14
- Version: 6.7.0
- Original notes: https://github.com/mobxjs/mobx/releases/tag/mobx%406.7.0
- Permalink: https://whatsnew.fyi/product/mobx/releases/6.7.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Proxied observable arrays can now safely read/write out of bound indices
- **added** — Add new option signal to when() to support abortion using an AbortSignal or AbortController
- **fixed** — Make return value of reportObserved match invoke of onBecomeObserved

###### Minor Changes

-   [`8cf4784f`](https://github.com/mobxjs/mobx/commit/8cf4784f53857cc977aed641bd778f2c14a080f5) [#3559](https://github.com/mobxjs/mobx/pull/3559) Thanks [@urugator](https://github.com/urugator)! - Proxied observable arrays can now safely read/write out of bound indices. See <https://github.com/mobxjs/mobx/discussions/3537>


-   [`223e3688`](https://github.com/mobxjs/mobx/commit/223e3688631528a327c79d39e2f497c6e1506165) [#3551](https://github.com/mobxjs/mobx/pull/3551) Thanks [@deadbeef84](https://github.com/deadbeef84)! - Added new option `signal` to `when()`, to support abortion using an AbortSignal / AbortController.

###### Patch Changes

-   [`fe25cfed`](https://github.com/mobxjs/mobx/commit/fe25cfede0aee3bddd7fa434a14ed4b40a57ee26) [#3566](https://github.com/mobxjs/mobx/pull/3566) Thanks [@upsuper](https://github.com/upsuper)! - Make return value of reportObserved match invoke of onBecomeObserved