What are you doing?

After upgrading to 4.43.0 (from 4.42.0), we can see the following SQL being produced:

UPDATE `Response` SET `deleted`='true',`updatedBy`=24751,`updatedAt`=NOW() WHERE `id` = 416695 AND `deleted` = 'false'

Note that deleted is being correctly to a string. This leads to the following error:

Error Code: 1292. Truncated incorrect DOUBLE value: 'false'

This code being used is:

await Response.update(
  {
    deleted: true,
  },
  {
    where: {id: existingResponse.id},
    ...context,
  }
);

The column is defined in the model as:

deleted: {
  type: DataTypes.TINYINT,
},

Reverting to 4.42.0 fixes the issue.

What do you expect to happen?

The latest version of Sequelize 4 should not convert my deleted booleans to strings.

What is actually happening?

The latest version of Sequelize 4 is converting my deleted booleans to strings.

Dialect: mysql
Database version: 5.7.23
Sequelize version: 4.43.0
Tested with latest release: Yes (of Sequelize 4)