We are using the locale-specific `toLowercase()` in a few places in both Bukkit and CraftBukkit. This can result in unexpected results for certain locales, such as turkish (tr-TR), which handles lowercase for the `I` character a bit differently. For example, in 1.20.4, the config deserialization of any item enchantments containing an `I` in their name was broken (I noticed it for the `PIERCING` enchantment).

Log.severe("Piercing enchantment name lowercase: " + Enchantment.PIERCING.getName().toLowerCase());
Log.severe("Piercing enchantment found?: " + Enchantment.getByName(Enchantment.PIERCING.getName()))

yields

Piercing enchantment name lowercase: pıercıng
Piercing enchantment found?: null

This no longer the case in 1.20.6 due to deserialization changes, but similar issues might likely still affect us in a few other places currently. For example:

• The deprecated Enchantment.getByName (in case any plugin still uses it directly)
• AttributeModifier deserialization: There are EquipmentSlotGroups that have an I in their name.
• Registry.match(String)
• WarningState.Value(String) (might not be affected currently, at least not or the turkish language, because they don't contain any "I" character).
• TODO Not sure yet if StringUtil.startsWithIgnoreCase is affected, which might impact tab completion of commands.
• TODO: Similar, there are quite a few uses in CraftBukkit.

TODO: Still need to check for and test more examples in which this might currently still be an issue.