Subj : Gmail address changes 📧, ChatGPT formatting blocks 🤖, Ruby 4 ♦️ To : All From : TLDR Date : Fri Dec 26 2025 11:23 am --5uR9QR3_ Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Google is gradually rolling out the option to change a Gmail address to a= new one (up to three times) with an altered username=C2=A0=E2=80=8C= =C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80= =8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0= =E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2= =A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C= =C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80= =8C=C2=A0=E2=80=8C=C2=A0=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2= =A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C= =C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80= =8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0= =E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2= =A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0=E2=80=8C=C2=A0 Si= gn Up [1] |Advertise [2]|View Online [3]=20 =09=09TLDR=20 =09=09TOGET= HER WITH [Delve] [4] TLDR 2025-12-26 DELVE SHIPMAS DAY 5: AUTOMA= TED SCREENSHOTS WITH DELVE CUA (SPONSOR) [4]=20 Welcome to the final = day of DELVE SHIPMAS =F0=9F=8E=84=C2=A0We've announced an AI copilot, AI-= native VRM, an AI security questionnaire extension, all-new frameworks, a= nd now: CUA. If you've ever spent hours: clicking through dashboards, = taking screenshots, labeling files, and then re-doing it all again for th= e next audit. =E2=80=A6this one's for you. Today, Delve is launching= DELVE CUA: a COMPUTER-USING AI AGENT THAT TAKES COMPLIANCE SCREENSHOTS F= OR YOU. Delve's agent securely navigates your tools, captures screensh= ots at the right moments, and attaches them directly to the correct contr= ols, while you focus on actually building security. You build. Delve= documents. That's compliance, finally automated end-to-end. Trusted= by 1,000+ OF THE FASTEST-GROWING COMPANIES, including 11x, Instantly, mi= cro1, Wisprflow, Greptile, Browser Use, and more. =F0=9F=91=89 BOOK A = DEMO here [4] to see Delve CUA in action and get $1,500 OFF with code DEL= VEXMAS5. =F0=9F=93=B1=20 BIG TECH & STARTUPS GOOGLE SAYS IT I= S =E2=80=98GRADUALLY ROLLING OUT' OPTION TO CHANGE YOUR @GMAIL.COM ADDRES= S (4 MINUTE READ) [5]=20 Google is gradually rolling out the option to = change a Gmail address to a new one (up to three times) with an altered u= sername. Users' original email address will still receive emails and work= for sign-in. Users will be unable to change or delete their email within= 12 months of each change. The support page detailing the update is curre= ntly only in Hindi.=20 CHATGPT'S NEW FORMATTING BLOCKS MAKE ITS UI LO= OK MORE LIKE A TASK TOOL (2 MINUTE READ) [6]=20 OpenAI has quietly ro= lled out a new feature that tweaks ChatGPT's layout to match the UI of th= e task it is supposed to execute. The new 'formatting box' mini editor to= olbar pops up when users highlight text inside ChatGPT's newer rich-text = areas. It shows drafts as formatted documents so users can edit them as t= hey would in any document editor. A screenshot of the feature is availabl= e in the article.=20 =F0=9F=9A=80=20 SCIENCE & FUTURISTIC TECHNOLOGY= US REGULATORS APPROVE WEGOVY PILL FOR WEIGHT LOSS (5 MINUTE READ) [7= ] A pill version of Wegovy has been approved in the US to treat = obesity. The ability of oral pills could expand the market by broadening = access and reducing costs. The pills are expected to be available within = weeks. The starting dose will be available for $149 per month from some p= roviders. Additional information on cost will be released in January.=20 = NASA WILL SOON FIND OUT IF THE PERSEVERANCE ROVER CAN REALLY PERSEVER= E ON MARS (13 MINUTE READ) [8]=20 Perseverance arrived on Mars nearly f= ive years ago. At the time, NASA had planned a mission to retrieve sample= s collected by the rover as soon as 2026, but now, no such mission is set= to launch until the 2030s. Perseverance appears to be in good condition = and should be able to operate for many years to come. The rover will cont= inue filling sample tubes in the expectation that they will eventually co= me back to Earth.=20 =F0=9F=92=BB=20 PROGRAMMING, DESIGN & DATA SCI= ENCE URL PATTERN API (17 MINUTE READ) [9]=20 The URL Pattern API = defines a syntax that is used to create URL pattern matchers. Patterns ar= e specified using the URLPattern interface with a pattern syntax based on= the syntax from the path-to-regexp library. They can contain capturing g= roups that extract parts of the matched URL. The API works across all of = the latest devices and browser versions.=20 RUBY 4.0.0 RELEASED (23 M= INUTE READ) [10]=20 Ruby 4.0 introduces Ruby Box and ZJIT and adds many= improvements. Ruby Box is a feature that provides separations about defi= nitions. Definitions loaded in a box are isolated in the box. ZJIT is a n= ew just-in-time compiler developed to raise the performance ceiling and= encourage more outside contributions. It is faster than the interprete= r, but not yet as fast as YJIT.=20 =F0=9F=8E=81=20 MISCELLANEOUS = AMAZON FACES =E2=80=98LEADER'S DILEMMA' =E2=80=94 FIGHT AI SHOPPING BOT= S OR JOIN THEM (7 MINUTE READ) [11]=20 Amazon is using its subsidiari= es to experiment with shopping agents as it continues to contemplate how = to deal with them. While the company may be willing to let agents access = its catalog, it likely wants to protect more valuable data, such as revie= ws, from its competitors. Its homegrown AI tools have improved since they= first launched. Amazon is now testing an agent that can purchase product= s from other sites directly in its e-commerce app.=20 WHEN ROBOT TAXI= S GET STUCK, A SECRET ARMY OF HUMANS COMES TO THE RESCUE (6 MINUTE READ) = [12]=20 Waymo vehicles become stranded if a human doesn't close the doo= r behind them at the end of a ride. Riders and passerbys are unreliable,= so Waymo summons help through an app called Honk, paying workers $20 o= r more for rescuing a robotaxi by closing a door. Last weekend's power ou= tage in San Francisco resulted in a severe gridlock throughout the city, = causing a flurry of requests for tow-truck companies to retrieve Waymo ve= hicles. These are examples of how, as automation advances, it can create = new work for humans to fix errors.=20 =E2=9A=A1=20 QUICK LINKS = CRAVING MORE AI IN YOUR INBOX? (SPONSOR) [13]=20 TLDR AI is your daily = fix of LLMs, GenAI, and deep learning goodness. Same TLDR format. Still f= ree. Subscribe now. [13] CODING INTELLIGENCE ASYMPTOTICS (4 MINU= TE READ) [14]=20 This post takes a look at what would happen if softwar= e were no longer constrained by the intelligence and time budget of the p= eople who develop it.=20 THE CONTEXT LAYER AI AGENTS ACTUALLY NEED (1= 5 MINUTE READ) [15]=20 Agents need to understand the full context befor= e they can meaningfully record why a decision was made.=20 THE HTML E= LEMENTS TIME FORGOT (10 MINUTE READ) [16]=20 There were plenty of eleme= nts left behind during HTML's 32 years of evolution.=20 CLAUDE HOW TO= (GITHUB REPO) [17]=20 A complete guide to Claude Code features.=20 = ASK HN: HOW DO I BRIDGE THE GAP BETWEEN PHD AND SWE EXPERIENCES? (HACKER= NEWS THREAD) [18]=20 Use software skills to get in the door as an engi= neer, and then weasel into a science position.=20 WINDSURF WAVE 13 BR= INGS FREE SWE-1.5 AND NEW UPGRADES (1 MINUTE READ) [19]=20 The Wave 1= 3 release adds multi-agent sessions, Git worktrees, and a layout that let= s users monitor agents side by side.=20 Love TLDR? Tell your friends and= get rewards! Share your referral link below with friends to get free= TLDR swag!=20 https://refer.tldr.tech/66662a80/ [20]=20 =09=09 Trac= k your referrals here. [21]=20 Want to advertise in TLDR? =F0=9F=93= =B0 If your company is interested in reaching an audience of tech e= xecutives, decision-makers and engineers, you may want to ADVERTISE WITH = US [22].=20 Want to work at TLDR? =F0=9F=92=BC APPLY HERE [23], CR= EATE YOUR OWN ROLE [24] or send a friend's resume to jobs@tldr.tech and g= et $1k if we hire them! TLDR is one of INC.'S BEST BOOTSTRAPPED BUSINESSE= S [25] of 2025.=20 If you have any comments or feedback, just respond t= o this email!=20 Thanks for reading,=20 Dan Ni [26] & Stephen Flanders [= 27]=20 Manage your subscriptions [28] to our other newsletters on tech,= startups, and programming. Or if TLDR isn't for you, please unsubscrib= e [29].=20 =20 Links: ------ [1] https://tldr.tech/signup?utm_sou= rce=3Dtldr [2] https://advertise.tldr.tech/?utm_source=3Dtldr&utm_medium= =3Dnewsletter&utm_campaign=3Dadvertisetopnav [3] https://a.tldrnewsletter= ..com/web-version?ep=3D1&lc=3D265280dc-d4e0-11f0-a661-1b9fa34a893d&p=3De3e9d= 6a2-e22a-11f0-afef-355d711e4cd9&pt=3Dcampaign&t=3D1766748200&s=3D7835630d46= 008974111f3a7de0d6af45bc70710128c4834cc938534f2c86fac9 [4] https://delve.= co/book-demo?utm_source=3Dtldr&utm_medium=3Dnewsletter&utm_campaign=3Dtldr-= primary-dec26-25 [5] https://9to5google.com/2025/12/24/google-change-gmai= l-addresses/?utm_source=3Dtldrnewsletter [6] https://www.bleepingcomputer= ..com/news/artificial-intelligence/chatgpts-new-formatting-blocks-make-its-u= i-look-more-like-a-task-tool/?utm_source=3Dtldrnewsletter [7] https://www= ..npr.org/2025/12/23/g-s1-103424/us-approve-pill-for-weight-loss?utm_source= =3Dtldrnewsletter [8] https://arstechnica.com/space/2025/12/nasa-will-soo= n-find-out-if-the-perseverance-rover-can-really-persevere-on-mars/?utm_sour= ce=3Dtldrnewsletter [9] https://developer.mozilla.org/en-US/docs/Web/API/= URL_Pattern_API?utm_source=3Dtldrnewsletter [10] https://www.ruby-lang.or= g/en/news/2025/12/25/ruby-4-0-0-released/?utm_source=3Dtldrnewsletter [11= ] https://www.cnbc.com/2025/12/24/amazon-faces-a-dilemma-fight-ai-shopping-= agents-or-join-them.html?utm_source=3Dtldrnewsletter [12] https://www.msn= ..com/en-us/news/us/when-robot-taxis-get-stuck-a-secret-army-of-humans-comes= -to-the-rescue/ar-AA1T0Xwv?utm_source=3Dtldrnewsletter [13] https://tldr.= tech/ai/?utm_source=3Dtldr&utm_medium=3Dnewsletter&utm_campaign=3Dquicklink= s12262025 [14] https://fi-le.net/asymptotics/?utm_source=3Dtldrnewsletter= [15] https://links.tldrnewsletter.com/HuAzei [16] https://htmhell.dev/= adventcalendar/2025/22/?utm_source=3Dtldrnewsletter [17] https://github.c= om/luongnv89/claude-howto?utm_source=3Dtldrnewsletter [18] https://news.y= combinator.com/item?id=3D46315658&utm_source=3Dtldrnewsletter [19] https:= //www.testingcatalog.com/windsurf-wave-13-brings-free-swe-1-5-and-new-upgra= des/?utm_source=3Dtldrnewsletter [20] https://refer.tldr.tech/66662a80/= [21] https://hub.sparklp.co/sub_e87ba9c7d7c0/1 [22] https://advertise.= tldr.tech/?utm_source=3Dtldr&utm_medium=3Dnewsletter&utm_campaign=3Dadverti= secta [23] https://jobs.ashbyhq.com/tldr.tech [24] https://jobs.ashbyhq= ..com/tldr.tech/c227b917-a6a4-40ce-8950-d3e165357871 [25] https://www.link= edin.com/feed/update/urn:li:activity:7401699691039830016/ [26] https://tw= itter.com/tldrdan [27] https://twitter.com/SteveFlanders22 [28] https:/= /tldr.tech/tech/manage?email=3Dtldrnewsletter%40synchro.net [29] https://= a.tldrnewsletter.com/unsubscribe?ep=3D1&l=3Dcfa2d55a-b7be-11e8-a3c9-06b79b6= 28af2&lc=3D265280dc-d4e0-11f0-a661-1b9fa34a893d&p=3De3e9d6a2-e22a-11f0-afef= -355d711e4cd9&pt=3Dcampaign&pv=3D4&spa=3D1766746888&t=3D1766748200&s=3Dfa13= 591c016b01adb2785c0a64a4bb7916669f97fc01d5177c7fca1185355ec5 --5uR9QR3_ Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable TLDR
Google is = gradually rolling out the option to change a Gmail address to a new one (up= to three times) with an altered username =E2=80=8C =E2=80=8C&nbs= p;=E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C&nbs= p;=E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C&nbs= p;=E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C&nbs= p;=E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C&nbs= p;=E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C  =E2=80= =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80= =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80= =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80= =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80= =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80= =8C 

TLDR

Together With 3D"Delve"

TLDR 2025-12-26

Delve Shipmas Day 5: Automa= ted Screenshots with Delve CUA (Sponsor)

Welcome to the final day of Del= ve Shipmas =F0=9F=8E=84 We've announced an AI copilot, AI-nat= ive VRM, an AI security questionnaire extension, all-new frameworks, and no= w: CUA.

If you've ever spent hours: clicking through dashboards, t= aking screenshots, labeling files, and then re-doing it all again for the n= ext audit.

=E2=80=A6this one's for you. Today, Delve is launching Delve CUA: a computer-using AI agent that takes compl= iance screenshots for you.

Delve's agent securely navigates = your tools, captures screenshots at the right moments, and attaches them di= rectly to the correct controls, while you focus on actually building securi= ty.

You build. Delve documents. That's compliance, finally automated = end-to-end.

Trusted by 1,000+ of the fastest-growing companie= s, including 11x, Instantly, micro1, Wisprflow, Greptile, Browser = Use, and more.

=F0=9F=91=89 Book a demo here to see Delve CUA in action = and get $1,500 off with code DELVEXMAS5.

=F0=9F= =93=B1

Big Tech & Startups

Google says it is =E2=80=98= gradually rolling out' option to change your @gmail.com address (4 minute r= ead)

Google is gradually rolling out the opt= ion to change a Gmail address to a new one (up to three times) with an alte= red username. Users' original email address will still receive emails and w= ork for sign-in. Users will be unable to change or delete their email withi= n 12 months of each change. The support page detailing the update is curren= tly only in Hindi.
ChatGPT's new formatting bl= ocks make its UI look more like a task tool (2 minute read)

OpenAI has quietly rolled out a new fea= ture that tweaks ChatGPT's layout to match the UI of the task it is suppose= d to execute. The new 'formatting box' mini editor toolbar pops up when use= rs highlight text inside ChatGPT's newer rich-text areas. It shows drafts a= s formatted documents so users can edit them as they would in any document = editor. A screenshot of the feature is available in the article.
=F0=9F= =9A=80

Science & Futuristic Technology

US regulators approve Wegov= y pill for weight loss (5 minute read)

A pill version of Wegovy has been appro= ved in the US to treat obesity. The ability of oral pills could expand the = market by broadening access and reducing costs. The pills are expected to b= e available within weeks. The starting dose will be available for $149 per = month from some providers. Additional information on cost will be released = in January.
NASA will soon find out if = the Perseverance rover can really persevere on Mars (13 minute read)

Perseverance arrived on Mars nearly fiv= e years ago. At the time, NASA had planned a mission to retrieve samples co= llected by the rover as soon as 2026, but now, no such mission is set to la= unch until the 2030s. Perseverance appears to be in good condition and shou= ld be able to operate for many years to come. The rover will continue filli= ng sample tubes in the expectation that they will eventually come back to E= arth.
=F0=9F= =92=BB

Programming, Design & Data Science

URL Pattern API (17 minute = read)

The URL Pattern API defines a syntax th= at is used to create URL pattern matchers. Patterns are specified using the= URLPattern interface with a pattern syntax based on the syntax from the pa= th-to-regexp library. They can contain capturing groups that extract parts = of the matched URL. The API works across all of the latest devices and brow= ser versions.
Ruby 4.0.0 Released (23 min= ute read)

Ruby 4.0 introduces Ruby Box and ZJIT a= nd adds many improvements. Ruby Box is a feature that provides separations = about definitions. Definitions loaded in a box are isolated in the box. ZJI= T is a new just-in-time compiler developed to raise the performance ceiling= and encourage more outside contributions. It is faster than the interprete= r, but not yet as fast as YJIT.
=F0=9F= =8E=81

Miscellaneous

<= /div>
Amazon faces =E2=80=98leade= r's dilemma' =E2=80=94 fight AI shopping bots or join them (7 minute read)<= /strong>

Amazon is using its subsidiaries to exp= eriment with shopping agents as it continues to contemplate how to deal wit= h them. While the company may be willing to let agents access its catalog, = it likely wants to protect more valuable data, such as reviews, from its co= mpetitors. Its homegrown AI tools have improved since they first launched. = Amazon is now testing an agent that can purchase products from other sites = directly in its e-commerce app.
When robot taxis get stuck,= a secret army of humans comes to the rescue (6 minute read)

Waymo vehicles become stranded if a hum= an doesn't close the door behind them at the end of a ride. Riders and pass= erbys are unreliable, so Waymo summons help through an app called Honk, pay= ing workers $20 or more for rescuing a robotaxi by closing a door. Last wee= kend's power outage in San Francisco resulted in a severe gridlock througho= ut the city, causing a flurry of requests for tow-truck companies to retrie= ve Waymo vehicles. These are examples of how, as automation advances, it ca= n create new work for humans to fix errors.
=E2=9A= =A1

Quick Links

Craving more AI in your inb= ox? (Sponsor)

TLDR AI is your daily fix of LLMs, GenA= I, and deep learning goodness. Same TLDR format. Still free.

Subscribe now.

Coding Intelligence Asympto= tics (4 minute read)

This post takes a look at what would ha= ppen if software were no longer constrained by the intelligence and time bu= dget of the people who develop it.
The Context Layer AI Agents= Actually Need (15 minute read)

Agents need to understand the full cont= ext before they can meaningfully record why a decision was made.
The HTML Elements Time Forg= ot (10 minute read)

There were plenty of elements left behi= nd during HTML's 32 years of evolution.
Claude How To (GitHub Repo)=

A complete guide to Claude Code feature= s.
Ask HN: How do I bridge the= gap between PhD and SWE experiences? (Hacker News Thread)

Use software skills to get in the door = as an engineer, and then weasel into a science position.
Windsurf Wave 13 brings fre= e SWE-1.5 and new upgrades (1 minute read)

The Wave 13 release adds multi-agent se= ssions, Git worktrees, and a layout that lets users monitor agents side by = side.

Love TLDR? Tell your friends and get rewards!

Share your referral link below with friends to get free TLDR swag!
https://refer.tldr.tech/66662a80/
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Want to advertise in TLDR? =F0=9F=93=B0

If your company is interested in reaching an audience of tech executives, d= ecision-makers and engineers, you may want to advertise with us.

Want to work at TLDR? =F0=9F=92=BC

Apply here, create your own role or send a friend's resume to jobs@tldr.tech an= d get $1k if we hire them! TLDR is one of Inc.'s Best Bootstrapped businesses = of 2025.

If you have any comments or feedback, just respond to this email!

Thanks for reading,
Dan Ni &a= mp; Stephen = Flanders


Manage your subscriptions to our other newsletters o= n tech, startups, and programming. Or if TLDR isn't for you, please unsubscribe.
3D"" --5uR9QR3_-- .