Validate Data and Instrument Contracts with clojure.spec
Learn how to use clojure.spec to validate data shapes and instrument function contracts, with a worked example, runtime limits, and common mistakes to avoid.
03 Oct 2025, 16:01 UTC
Loading…
ReadMeFeed / Community knowledge
The knowledge journal
Practical guides, fresh perspectives and ideas worth trying.
GCC's `__builtin_expect`: Telling the Compiler What You Already Know
A practical guide to using GCC's `__builtin_expect` to move cold error paths out of hot loops, with verification steps and honest trade-offs.
04 Oct 2025, 20:48 UTC
Discloud Autoscaling for Node.js: Picking CPU Thresholds That Avoid the 502 Window
Node.js saturates on a single thread, and Discloud's CPU-based horizontal scaling has a reaction delay. Here is how to set per-service thresholds and replica limits so traffic spikes do not turn into user-facing errors.
13 Mar 2026, 13:01 UTC
Monetizing Ghost Content with Members and Stripe: An Architecture Note
A practical architecture note for monetizing Ghost with native Members and Stripe: requirements, trust boundaries, operational checks, and failure modes.
12 Dec 2025, 15:41 UTC
Controlling Resource Creation Order in Argo CD with Sync Waves and Auto-Sync
Argo CD applies resources in parallel during auto-sync unless you use sync-wave annotations. Learn how to stage namespace, deployment, and service creation with a worked example.
20 Apr 2026, 12:17 UTC
Aerospike Predicate Filtering: Trimming Query Results Without Dropping Your Indexes
Learn when Aerospike server-side predicate filtering reduces network payload alongside secondary indexes, and why it doesn't replace indexing.
11 Apr 2026, 19:43 UTC
Model Post Images as Hugo Page Resources, Not static/ Files
Hard-coded image URLs in static/ break when baseURL or language settings change. Model post images as Hugo page resources in leaf bundles so Hugo generates portable URLs and you gain image-processing control.
15 Sept 2026, 19:34 UTC
C# Records for Immutable DTOs: Equality, Copies, and Limits
Records reduce boilerplate for immutable DTOs and value objects by generating value-based equality. Learn how positional records work, where shallow equality bites, and how to verify the behavior.
17 Jul 2026, 13:13 UTC
Speeding Up Live Plots in Matplotlib with Object‑Oriented API and Blitting
When you need to stream thousands of data points per second, a naive Matplotlib update stalls. This post shows how to use the object‑oriented API and blitting to cut redraw time by an order of magnitude, with a full example, trade‑offs, and next steps.
29 Jan 2026, 17:23 UTC
Sourcetree Custom Actions: One‑Click Git Workflow Automation
Sourcetree Custom Actions let you bind scripts to GUI menu items, passing Git context like commit SHA or file paths. Learn how to configure an “Open in GitHub” action, test parameter substitution, and avoid common pitfalls such as quoting and environment differences.
20 Sept 2026, 20:11 UTC
Jetstream 2FA ships fast, recovery is on you
Jetstream gives you TOTP-based 2FA via Fortify in minutes, but it leaves user recovery and secret management as an explicit engineering decision.
30 Jul 2026, 12:49 UTC
Codeac and Hibernate pagination: why offset pagination is a liability at scale
Offset pagination with Hibernate setFirstResult/setMaxResults degrades linearly and drifts with data changes. Codeac flags the pattern and guides teams toward keyset pagination or ScrollableResults for stable large-dataset access.
05 Oct 2025, 15:30 UTC
Cairo Antialiasing Modes: When SUBPIXEL Helps and When It Hurts
Cairo offers NONE, GRAY and SUBPIXEL antialiasing, but SUBPIXEL is silently downgraded on PDF/PS. Match the mode to the surface type for predictable rendering.
23 Oct 2025, 07:00 UTC
Diagnosing and Fixing openSUSE Btrfs Snapshot Rollback Failures
A diagnostic guide for resolving openSUSE Btrfs snapshot rollback failures, covering GRUB menu errors, subvolume mismatches, and Snapper configuration fixes.
13 Apr 2026, 14:41 UTC
Enforcing Trust Boundaries in Gatling with Response Checks
Learn how to use Gatling HTTP response checks to create trust boundaries, preventing invalid data propagation and ensuring load test accuracy.
12 Aug 2026, 07:46 UTC
Elixir Supervisor Restart Strategy Diagnostic Guide: Recognize, Check, Fix, Escalate
Frequent `:shutdown` messages and CPU spikes signal rapid child restarts; this guide shows how to diagnose and fix Supervisor restart strategy issues in Elixir.
12 Jul 2026, 05:27 UTC
Speed Up Vagrant File I/O with NFS Synced Folders
Learn how to configure Vagrant to use NFS for synced folders, verify the mount, and see when the performance boost matters.
07 Feb 2026, 15:14 UTC
Using Liquibase Contexts to Control Environment‑Specific Schema Changes
Learn how to use Liquibase changelog contexts to apply environment‑specific changesets without duplicating files, with a concrete YAML example and practical verification steps.
16 Sept 2026, 10:37 UTC
Choosing Between Rancher Built‑In Monitoring and a Self‑Managed Stack
Decide whether to use Rancher’s built‑in monitoring or a self‑managed stack, compare resource overhead and flexibility, then follow a step‑by‑step enable‑and‑verify procedure.
28 Oct 2025, 00:22 UTC
Enabling and Fine‑Tuning the Cycles Denoiser in Blender
Step‑by‑step guide to enable Blender’s Cycles denoiser, choose the right type for your hardware, set passes, and verify the result while keeping fallback options.
05 Jul 2025, 17:17 UTC
Using Cloudflare Workers KV as a Session Store for Stateless Edge Apps
Learn how to use Cloudflare Workers KV as a lightweight, globally distributed session store for stateless edge applications, including a code example, consistency trade‑offs, and practical verification steps.
19 Sept 2026, 17:05 UTC
Providing Outbound-Only Internet Access in IBM Cloud VPC with a Zonal Public Gateway
Learn how to give private IBM Cloud VPC subnets outbound-only internet access using a zonal public gateway, with routing, security group, and ACL configuration steps.
03 Aug 2025, 21:07 UTC
Why CLion Shows Raw Pointers for Custom C++ Containers (and How to Fix It)
CLion delegates variable rendering to your debugger backend. Learn how to register a GDB pretty-printer so a custom linked list shows logical fields instead of raw pointer addresses.
28 Jun 2026, 23:59 UTC
Diagnosing Stale or Missing Data in Apollo Client InMemoryCache
When a mutation returns correct data but the UI shows stale or missing values, the cause is usually cache identity or typePolicies. Use this diagnostic guide to isolate the issue before adding refetches.
03 Aug 2026, 01:08 UTC
Keras EarlyStopping and ModelCheckpoint: Keeping the Best Epoch Without Guessing
Validation loss often bottoms out mid-training. Pair EarlyStopping with ModelCheckpoint to keep the best epoch, match monitor modes correctly, and handle version-sensitive serialization.
29 Sept 2025, 15:58 UTC
Leveraging Framework7 Navigation in Vue 3: A Practical Guide to Native‑Style Page Transitions
Build native‑style page transitions in Vue 3 with Framework7’s lightweight navigation stack. Learn how to set up <f7-page> components, apply custom transitions, and weigh trade‑offs like SEO and bundle size.
15 Aug 2026, 12:46 UTC
Designing a Robust Zsh Hook System: Requirements, Minimal Architecture, and Failure Mitigation
Learn how to build a lightweight, event‑driven hook system in Zsh that keeps startup fast, avoids global variable collisions, and includes diagnostics to catch latency or failure modes early.
07 May 2026, 12:04 UTC
Lock-Free Code on ARM64: Why x86 Intuition Fails and What Replaces It
Moving x86 lock-free code to ARM64 often exposes hidden ordering assumptions. Learn why plain stores are not enough, how acquire/release primitives map to LDAR/STLR, and when ARMv8.1 LSE atomics are safe to use.
25 Aug 2026, 17:45 UTC
Webpack 5 Filesystem Cache Not Speeding Up Rebuilds? A Diagnostic Guide
Webpack 5 persistent filesystem cache misses can make rebuilds as slow as clean builds. This diagnostic guide covers ordered checks, a cause table, and fixes for cacheDirectory, buildDependencies, and snapshot scoping.
17 Dec 2025, 23:57 UTC
Fixing N+1 Queries in AdonisJS with Lucid Preloading
Learn how to use Lucid ORM's preload method in AdonisJS to eliminate N+1 queries, with a worked example, pagination tips, and trade-offs to consider.
20 Apr 2026, 10:19 UTC
Babel preset-env targets: stop transpiling what browsers already run
A tight target query is what keeps @babel/preset-env from rewriting syntax your users already run. Diff two target sets, keep ES modules for the bundler, and verify the result.
09 Sept 2025, 11:40 UTC
Securing the Traefik Dashboard with an Internal Entrypoint and BasicAuth
Bind the Traefik dashboard to a private entrypoint, gate it with BasicAuth middleware, and verify access with curl. Includes recovery steps for lost credentials.
06 Jun 2026, 06:59 UTC
FastAPI Dependency Injection Failures: A Diagnostic Guide
A diagnostic guide to FastAPI dependency injection failures: how to spot a missing Depends marker, a called dependency, leaked test overrides, and blocking async dependencies.
01 Feb 2026, 09:18 UTC
After Effects Expressions: Linking Opacity to Layer Position with linear()
Link a layer's opacity to another layer's horizontal position in After Effects using a JavaScript expression. Learn the exact attachment steps, a worked linear() example, and how to verify the behavior locally.
15 Dec 2025, 10:07 UTC
Offset vs Cursor Pagination in GraphQL: Which to Choose and How to Implement
Picking pagination for a GraphQL API is a trade-off between simplicity and stability. This guide compares offset and cursor pagination, shows trade-offs, and gives a concrete Relay Connection example you can validate.
21 Jan 2026, 21:10 UTC
Canva Apps SDK: OAuth-scoped access to designs with a minimal manifest
Build Canva editor-integrated apps with OAuth 2.0 consent and a manifest-declared scope set. See a minimal manifest, token exchange wiring, limits and verification steps.
08 Oct 2026, 09:11 UTC
CentOS Stream as a RHEL preview: test before you migrate
CentOS Stream is not a stable RHEL clone. It is a rolling preview that sits upstream of RHEL, letting teams test application compatibility against upcoming RHEL changes before they land in production.
10 Dec 2025, 11:18 UTC
Managing Variable Collision in Insomnia: Mastering Precedence and Fallbacks
Stop guessing which environment variable is being used. Learn how Insomnia's four-tier precedence chain works and how to use fallbacks and explicit overrides to manage API collections.
12 Mar 2026, 12:44 UTC
Fastify Schema‑Driven Validation and Serialization as an API Boundary
Learn how to place JSON Schema validation at the edge of a Fastify service and enforce response contracts with hooks, plus the checks and failure modes to monitor.
24 Sept 2026, 20:38 UTC
How to Verify and Use DirectStorage in Windows 11 for Faster Game Loads
Learn how to check if your Windows 11 PC supports DirectStorage, enable it, and measure its impact on game load times and frame pacing.
29 Aug 2025, 08:36 UTC
Diagnosing PM2 Crash Loops and Unexpected Restarts in Node.js Applications
A diagnostic guide for PM2-managed Node.js apps stuck in crash loops: recognize the symptoms, correlate logs with restart counts, and apply targeted fixes for exceptions, port conflicts, OOM kills, and stale environments.
04 Aug 2026, 02:13 UTC
Using Dyalog APL Component Files for Persistent Array Storage
Learn how to store, retrieve, and update APL arrays with Dyalog’s component file system, including a concrete example and notes on portability and concurrency.
28 Aug 2025, 04:42 UTC
Refactor Terraform Without Destruction: A Practical Guide to `moved` Blocks
Renaming a Terraform resource usually triggers a destroy and create. `moved` blocks let you refactor addresses without replacing infrastructure—if you know their limits.
30 Jul 2026, 15:13 UTC
Taming Jenkinsfile Sprawl with Shared Libraries
Stop copying Docker build and notification logic across Jenkinsfiles. Learn how Jenkins Shared Libraries centralize pipeline code with version pinning.
19 Oct 2025, 23:52 UTC
Architecting Pagination in Django REST Framework: Boundaries, Failure Modes, and Scaling Limits
A practical architecture note on selecting PageNumberPagination, LimitOffsetPagination, or CursorPagination in Django REST Framework, covering trust boundaries, operational checks, and failure modes.
09 Jun 2026, 12:28 UTC
Enforcing Multi-Document ACID Invariants with Fauna FQL
Fauna executes an entire FQL expression as one ACID transaction, letting you enforce multi-document invariants like balance transfers directly in the query instead of application code.
12 Aug 2026, 04:16 UTC
Bulma Sass Customization: Theme Variables and Selective Component Imports
Learn how to control Bulma's theme colors and CSS bundle size by setting Sass variables before import and loading only the components you need.
24 Dec 2025, 05:29 UTC
Traefik Mesh Canary Releases: Choosing and Validating SMI TrafficSplit
Learn how to implement weighted canary releases in Traefik Mesh using SMI TrafficSplit, including constraints, alternatives, and validation steps.
28 Jan 2026, 17:13 UTC
Replacing Legacy Input with Enhanced Input in Unreal Engine 5
Learn how Unreal Engine 5's Enhanced Input System decouples physical keys from game intent using Input Actions and Mapping Contexts, with a C++ setup, cleanup rules, and common pitfalls.
08 Apr 2026, 17:21 UTC
Forgejo CODEOWNERS and Protected Branches: Version Your Review Routing
Move 'who reviews this?' from Slack to your repo. Forgejo reads CODEOWNERS to auto-request reviewers, and branch protection turns that routing into a merge requirement.
21 Jun 2026, 11:49 UTC