YAML Norway Problem and Cron's Day-of-Month Trap Highlight Config Format Pitfalls

The YAML Norway problem occurs when parsers misinterpret values like the country code 'NO' as a boolean false. Cron expressions can also mislead, as a rule meant for 'the first Monday of the month' may run daily for a week. These issues arise because config formats follow strict, non-intuitive rules rather than user assumptions. Free browser simulators for YAML and cron have been built to make these parsing rules visible and help developers avoid errors.