enforce-storage-engine=InnoDB has no usability as an option to mysqld-install-db

Starting mysqld-install-db server setup with --enforce-storage-engine=InnoDB gives:

2021-08-16 11:45:47 23042769061632 [ERROR] InnoDB: Trying to create a MySQL system table `mysql`.`db` of type InnoDB. MySQL system tables must be of the MyISAM type!

ERROR: 1005  Can't create table `mysql`.`db` (errno: 168 "Unknown (generic) error from engine")

2021-08-16 11:45:47 23042925725632 [ERROR] Aborting

Interesting is also the 168 unknown error from InnoDB.

Perhaps a better way to handle this would be to automatically make system tables MyISAM (without any overwrite possibility). This would also make sense given that a server which already has MyISAM system tables can be started fine with --enforce-storage-engine=InnoDB thereafter, i.e. the "enforce" naming can be misleading in any case.

Another option is to disable the enforce-storage-engine option (or the InnoDB setting specifically) for mysqld-install-db only.