PASSWORD_DEFAULT is explicitly allowed to change between releases, and it does. Anything storing the constant’s current value, or sizing a column for today’s output, is storing a decision…
A child class could never remove a parameter type from a method it overrides, even though accepting more than the parent is safe by the same rule that…
Configuration is assembled from several sources in order, each overriding the last, with environment variables last — so the same file works in development and is overridden in…
Chrome made touchstart and touchmove listeners on the document and window passive by default, which improves scrolling everywhere and silently breaks anything relying on preventDefault() there. A pull-to-refresh…
An order, a refund and a subscription are all shop_order-ish posts and are not the same class, so code type-hinting WC_Order breaks the first time a refund arrives.…
The tabular EXPLAIN says which index was used and not how expensive the optimiser thought each option was, which is the information you want when it chose one…
Covering indexes are usually explained in terms of avoiding a row lookup. The other half is that an index is already ordered, so a sort matching the index…
Composer downloads packages one at a time, which on a cold cache with sixty dependencies is mostly waiting on latency. A plugin parallelises it and the improvement is…
Reads moved to a replica and checkout started showing empty carts. Read-after-write, sticky connections, and measuring the lag rather than assuming it.
Rather than coordinating who recomputes, let each reader decide independently with a probability that rises as the expiry approaches — so one request refreshes early and the rest…