Byebug 11.1.3 can trigger NameError with Rails 6 zeitwerk autoloading; binding.pry, eager loading, or another debugger avoid the issue.

File renames can hide earlier revisions from git log; git log --follow preserves the full history for a single renamed file.

HTTPS requests fail against self-signed certificates or broken certificate chains unless the correct CA, intermediate cert, or certificate store is configured.

Invalidly encoded external strings can break UTF-8 handling; trying several conversions and replacing unknown bytes helps salvage readable text.

Browser caching can show stale state in apps like time trackers or SPAs. Setting Cache-Control: no-store forces a fresh response instead of reusing cached pages.

Publish npm pre-release versions on a separate tag so stable users do not receive alpha or beta builds by default.

Release candidate and beta gem versions are treated as pre-releases and are ignored unless explicitly requested; RubyGems converts dash-separated SemVer pre-release tags to dot-separated versions.

Dynamic ActiveSupport::Concern relations can misread self.class in polymorphic associations, producing the wrong condition. Using self.included with the host class keeps has_many scopes bound correctly.

Exclude individual files from RubyMine search and navigation by adding filename masks in Project Structure settings.

Large CarrierWave stores can overload a single directory with too many entries, slowing navigation and filesystem operations. Splitting record IDs into nested folders keeps directories manageable.

Slow Webpack builds can be profiled to pinpoint time spent in loaders and modules. Speed Measure Plugin adds per-compile timing output for identifying optimization opportunities.

Run code before or after an existing Rake task by adding dependencies or enhancing the task with a block.

Large libraries can bloat every page when only one screen needs them. import() loads code on demand and Webpack emits a separate chunk automatically.

Webpacker compiles assets on demand in Rails, which can freeze helpers and slow page reloads when no dev server is running.

grep supports basic, extended POSIX, and Perl-compatible regular expressions; -P is often closest to Ruby-style regex syntax, while -G and -E differ in metacharacter handling.

Control when CI jobs run by matching branches, merge requests, and other pipeline conditions with rules; rules replaces only and except in GitLab 12.3+.

Offline gem installation with Bundler requires checking dependencies into the repository and configuring local paths for bundle install without rubygems.org access.

Create and verify bcrypt password hashes for Apache authentication, with safer handling than command-line password entry.

document.currentScript is missing in older browsers, making it hard to read a running <script> element’s attributes or nearby DOM. A simple document.scripts fallback works only for non-async scripts.

Newer Passenger versions change passenger -v output, breaking capistrano-passenger version parsing and causing undefined method '[]' for nil:NilClass during deployment.