Records described as "immutable by default" when they are not

[jbogard]

Only certain usages of the record syntax provide "immutable by default". However, it is possible (and quite easy) to create a mutable record type:

public record Person
{
    public string LastName { get; set; }
    public string FirstName { get; set; }
}

var person = new Person { FirstName = "Jimmy", LastName = "Bogard" };
person.LastName = "Fallon";

This all compiles and runs.

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• ID: c36588d0-6bdf-1740-220c-10b20bb88730
• Version Independent ID: 587ed47f-f532-e018-9b0d-6ee76afd20e4
• Content: What's new in C# 9.0 - C# Guide
• Content Source: docs/csharp/whats-new/csharp-9.md
• Product: dotnet-csharp
• Technology: csharp-whats-new
• GitHub Login: @BillWagner
• Microsoft Alias: wiwagn

[BillWagner]

Thanks @jbogard

As I add more tutorial content on records, more of the examples will reinforce your point. I'll update this in the same way before the release.