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Add v1.5.31 upgrade advisory to the website "what's new" section #7385

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Nov 11, 2024
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Add v1.5.31 upgrade advisory to the website "what's new" section #7385

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Add v1.5.31 upgrade advisory
Arkatufus Nov 11, 2024
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Merge remote-tracking branch 'upstream/dev' into add-v1.5.31-upgrade-…
Arkatufus Nov 11, 2024
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8 changes: 8 additions & 0 deletions docs/community/whats-new/akkadotnet-v1.5-upgrade-advisories.md
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Expand Up @@ -11,6 +11,14 @@ This document contains specific upgrade suggestions, warnings, and notices that
<iframe width="560" height="315" src="https://www.youtube.com/embed/-UPestlIw4k" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
<!-- markdownlint-enable MD033 -->

## Upgrading to Akka.NET v1.5.31

Akka.NET v1.5.31 introduces a breaking behavior change to actor `Stash`. In previous behavior, `Stash` will filter out any messages that are identical (see explanation below) when it is prepended with another. It will not do so now, which is the actual intended behavior.

This change will affect `Akka.Persistence` users or users who use the `Stash.Prepend()` method in their code. You will need to add a de-duplication code if your code depends on sending identical messages multiple times to a persistence actor while it is recovering.

Messages are considered as identical if they are sent from the same sender actor and have a payload message that `Equals()` to true against another message. Example payload types would be an object pointing to the same memory address (`ReferenceEquals()` returns true), value types (enum, primitives, structs), and classes that implements the `IEquatable` interface.

## Upgrading to Akka.NET v1.5.15

Akka.NET v1.5.15 introduces several major changes:
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