private Optional<String> playerGetOption(ServerPlayerEntity player, String key) {
        return Optional.ofNullable(((MixinUser) player).luckperms$getOption(key));
    }
Listener to route permission checks made via fabric-permissions-api to LuckPerms.
fabric/src/main/java/me/lucko/luckperms/fabric/listeners/FabricPermissionsApiListener.java