TypeORM booleans use tinyint (4) instead of the standard tinyint (1)

Issue type: [x] bug report Database system/driver: [x] mysql / mariadb TypeORM version: [x] latest Steps to reproduce or a small repository showing the problem:

Create a entity modal with a boolean type and use it in MySQL.

@Entity()
export class Foo {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  isBar: boolean = false;
}

When you sync with the database you’ll find that the isBar column is equivalent to tinyint (4) because TypeORM uses tinyint as the type without a size.

However, the standard for booleans in MySQL is tinyint (1). MySQL has an official BOOL/BOOLEAN alias type, which is an alias to tinyint (1) not tinyint (4). And other ORMs properly use tinyint (1) for their booleans, e.g. I’m migrating a Doctrine based project to TypeORM and need to manually specify the widths of my booleans to avoid counterproductive migrations being created.