default @NotNull String lowerValue() {
      return this.value().toLowerCase(Locale.ROOT);
    }
Returns the value of this argument, lower-cased in the root locale.

<p>This value should be used for comparisons against literals, to help ensure MiniMessage tags are case-insensitive.</p>

@return the lower-cased value of this argument
@since 4.10.0
text-minimessage/src/main/java/net/kyori/adventure/text/minimessage/tag/Tag.java