A concrete example of the usage could be added

@BillWagner

At first glance this seems to be the same as passing by value without the in keyword. To illustrate the difference, an example such as in the top comment of this post could be added. https://stackoverflow.com/questions/52820372/why-would-one-ever-use-the-in-parameter-modifier-in-c

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ID: 6b1434b0-5459-7569-47f7-46bf33fc3953
Version Independent ID: 8a4ae81b-1ae5-cbe6-d58b-df455414e245
Content: in parameter modifier - C# Reference
Content Source: docs/csharp/language-reference/keywords/in-parameter-modifier.md
Product: dotnet-csharp
Technology: csharp-language-reference
GitHub Login: @BillWagner
Microsoft Alias: wiwagn

@Catacomba

Thanks for noting this @Catacomba
This is related to #21691

I'll address it this month as part of that work.

clarify defensive copies

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