MariaDB Galera Cluster does not enforce slave_type_conversions

-- On node 1

set global slave_type_conversions='ALL_LOSSY';

create table testconv (id int primary key);

set wsrep_osu_method='RSU';

alter table testconv modify column id bigint unsigned;

set wsrep_osu_method='TOI';

-- On node 2

insert into testconv values(1);

160129  9:51:46 [ERROR] Slave SQL: Column 0 of table 'test.testconv' cannot be converted from type 'int' to type 'bigint(20) unsigned', Internal MariaDB error code: 1677

160129  9:51:46 [Warning] WSREP: RBR event 3 Write_rows_v1 apply warning: 3, 11

160129  9:51:46 [Warning] WSREP: Failed to apply app buffer: seqno: 11, status: 1