A 162-case truth table recorded from WinterCMS's validator (the vendored
winter/storm Factory, Laravel 9) found three divergences, all on arrays:
- in compared array elements loosely; Laravel uses array_diff, an exact
string comparison, so ["1.0"] is not in 1,2;
- not_in failed when any element was listed; Laravel's validateNotIn is
!validateIn, so an array passes unless every element is listed;
- not_in failed an array without the array rule; Laravel passes it.
validate_rules_test.go keeps the whole table (accepted, array keys,
boolean, numeric, integer, in/not_in, sizes by type, regex, dates and
comparisons, url, presence, nested and map wildcards, bail and order).
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