PHPUnit 6's release broke test suites for developers using overly permissive version constraints like `*` or `>= 4.8` in their composer.json. The post explains why wildcard and unbounded version ranges are dangerous, how semantic versioning works, and why the caret operator (`^`) is the correct approach. It also advocates for keeping dependencies fresh and treating major version upgrades as deliberate, process-driven decisions rather than automatic updates.
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