Stephen D. Moreira🅰️

Master of the Mystic Arts. (End to End Full Product Software Engineer)

[Ryan Els @RyanEls4]

Vibe Coders be like 😂🤭

[Stephen D. Moreira🅰️ @smorebytes]

@Bardopacotilla Groups of Gods and Dragons are no match for A.I.

I think we need to start rethinking the power hierarchy of some of these concepts.

[Anton Martyniuk @AntonMartyniuk]

.NET 11 and C# 15 are out today.

Here's everything that changes for you, in 2 minutes 👇

𝗖# 𝟭𝟱
• Union Types: a value is one of a fixed set of types, and the compiler checks every case
• Closed hierarchies: a closed class can only be extended inside its assembly
• Collection expression arguments: [with(capacity: 10), .. items]
• Extension indexers
• Labeled break and continue for nested loops

𝗥𝘂𝗻𝘁𝗶𝗺𝗲
• Runtime Async: no more compiler-made state machines, faster async code, 5 stack frames instead of 13
• Smarter JIT: fewer bounds checks, better devirtualization
• File-based apps across many files with #:include

𝗟𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀
• LeftJoin, RightJoin and the new FullJoin return tuples
• Process.RunAndCaptureTextAsync: run a process and read its output in one call
• JSON Lines output when streaming IAsyncEnumerable

𝗔𝗦𝗣 .𝗡𝗘𝗧 𝗖𝗼𝗿𝗲
• Async validation in Minimal APIs: check the database inside a validation attribute
• Built-in validation localization
• Native OpenTelemetry tracing without an extra package
• OpenAPI 3.2 by default, with real schemas for Server-Sent Events
• MCP server template ships with the SDK

𝗘𝗙 𝗖𝗼𝗿𝗲 𝟭𝟭
• Better SQL for Include: 29% faster split queries in EF team tests
• FullJoin translates to SQL FULL JOIN
• MaxBy and MinBy translation
• Complex types with TPT/TPC, keys and indexes
• Vector search and hybrid search, vector columns no longer loaded by default
• Migrations: --add, a dotnet-ef.json config, --context "*"

𝗕𝗿𝗲𝗮𝗸𝗶𝗻𝗴 𝗰𝗵𝗮𝗻𝗴𝗲𝘀 𝘁𝗼 𝗰𝗵𝗲𝗰𝗸
• New minimum CPU: x86-64-v2
• A failing BackgroundService now makes IHost.RunAsync throw
• Corrupted ZIP and TAR files now throw InvalidDataException
• EF Core uses SQL Server compatibility level 160 by default
• The EF Core Cosmos DB provider moves to System.Text.Json

📌 𝗦𝗵𝗼𝘂𝗹𝗱 𝘆𝗼𝘂 𝘂𝗽𝗴𝗿𝗮𝗱𝗲?

.NET 11 is an STS release with 24 months of support (until November 2028).

On .NET 10 LTS? There is no rush for production apps.

But Union Types and Runtime Async are worth the upgrade.

I'm moving my projects in November and December.

👉 I explained every feature with code examples here (and the breaking changes you need to know):
↳ https://t.co/4tJS9vF9jz

Join 28,000 readers in my free newsletter, I will write more in depth about .NET 11 and C# 15 features in November. And how to use new features with your AI agent.

Will you upgrade to .NET 11 this year?

[Upwind Security MDR @UpwindMDR]

🚨 CRITICAL - Unauthenticated RCE in React Server Components (GHSA-xqc2-xf4c-x3h3)

A critical vulnerability in React Server Components packages (react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel) allows unauthenticated remote attackers to execute arbitrary code via crafted RSC Flight payload responses transporting multiple typed arrays and attacker-controlled values.

👉 Affected: Versions 19.0.0–19.0.8, 19.1.0–19.1.9, 19.2.0–19.2.8, 19.3.0 | Upgrade immediately to 19.0.9, 19.1.10, 19.2.9, or 19.3.1 (or Next.js 16.4.1 / 15.5.28)

https://t.co/Kbpu3ws8Om

[Stephen D. Moreira🅰️ @smorebytes]

@Lucas_R_R @yashvinder79171 This makes the most sense given the entire context, every nation is represented at the table.

[Stephen D. Moreira🅰️ @smorebytes]

@DanielGlejzner That’s the other big part is they are internal/just never updated, so you won’t even see them on the npm download stat at all PLUS angular.js was from an era where we weren’t using npm to get angular.js , dependencies were manually managed.

[Stephen D. Moreira🅰️ @smorebytes]

@walkingriver tough spot to be in for sure

[Stephen D. Moreira🅰️ @smorebytes]

@addyosmani @yagiznizipli on the iphone duo, x seems to be buggy af, constant flickering

[Stephen D. Moreira🅰️ @smorebytes]

Going to bite the bullet soon and get a Miniforums for my local ai workflows.

[Stephen D. Moreira🅰️ @smorebytes]

@NFLosophy Voted against it as well, I’ll get the benefits, but yea same conclusions as you, plus i expect home prices to rise as the market will stabilize with that gone now. Will be happy to be wrong, hope it works out.

[Stephen D. Moreira🅰️ @smorebytes]

@jajones116 @BerryLemonPi Well the problem is how easy can the definition of homestead change, if corporations/LLC’s start being included in the future by some loophole. Corporations are people is the law of the land, so you can imagine something shady occuring down the line.

[Stephen D. Moreira🅰️ @smorebytes]

@BQRMagic You’re gonna get a lot of low IQ responses. I hope for the best, my main concern is the eventual loop holes that will be down the line for corporates.

[Stephen D. Moreira🅰️ @smorebytes]

@thescottbarber ketchup chips so good

[Stephen D. Moreira🅰️ @smorebytes]

@KBTesla1 @Apple For sure, not everyone should be an early adopter. Love it, but I’m pretty techy.

[Stephen D. Moreira🅰️ @smorebytes]

@AppleSnob_ nah, skill issue. Open table i think is a good example of how to optimize

[Stephen D. Moreira🅰️ @smorebytes]

@maywrld01 Apple watch unlock has been working perfectly for the duo

[Stephen D. Moreira🅰️ @smorebytes]

@Doro44 this has to be a troll post at this point

[Stephen D. Moreira🅰️ @smorebytes]

@niccruzpatane great takes, i feel the same so far, im excited for game optimizations, it actually already feels so good for games unoptimized.

[Stephen D. Moreira🅰️ @smorebytes]

boo