Breaking change [45115]: Disallow custom implementations of typed data.

[Lasse R.H. Nielsen]

We propose to disallow any non-platform implementation of the typed-data classes of `dart:typed_data` (everything except the `BytesBuilder` classes).

See 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.

/L

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Lasse R.H. Nielsen - l...@google.com  

'Faith without judgement merely degrades the spirit divine'
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