# Dart: Breaking change \[45115\]: Disallow custom implementations of typed data

**URL:** <https://forum.devtalk.com/t/dart-breaking-change-45115-disallow-custom-implementations-of-typed-data/7484>\
**Category:** Frontend Official News\
**Tags:** newsbot, dart, official-news\
**Created:** [1 March 2021 12:00 UTC](https://forum.devtalk.com/t/dart-breaking-change-45115-disallow-custom-implementations-of-typed-data/7484 "2021-03-01T12:00:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NewsBot](https://forum.devtalk.com/user_avatar/forum.devtalk.com/newsbot/32/1114_2.png) [@NewsBot](https://forum.devtalk.com/u/NewsBot)\
**Post date:** [1 March 2021 12:00 UTC](https://forum.devtalk.com/t/dart-breaking-change-45115-disallow-custom-implementations-of-typed-data/7484/1 "2021-03-01T12:00:27Z")

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A new [Dart](https://devtalk.com/dart) blog post/announcement has been posted!

> [@](#):
>
> We propose to disallow any non-platform implementation of the typed-data classes of `dart:typed_data` (everything except the `BytesBuilder` classes). See [Breaking Change Request: Make typed data classes sealed platform types. · Issue #45115 · dart-lang/sdk · GitHub](https://github.com/dart-lang/sdk/issues/45115) for details. If you think this would be a problem for you, please chime in here and let us know.

Get the full details here: [https://groups.google.com/a/dartlang.org/d/msg/announce/oLtDPsVPVSc/hzsIEWKTAgAJ](https://groups.google.com/a/dartlang.org/d/msg/announce/oLtDPsVPVSc/hzsIEWKTAgAJ)