MysqlQueryTransformer.prepareHydratedValue does not convert boolean or decimal

[chadfaurie]

Package versions and database engine type (please complete the following information):

• Mysql
• TypeORM Version: 0.2.41
• Driver Version: 2.3.5

Describe the bug
The MysqlQueryTransformer.prepareHydratedValue does not convert field of type boolean instead looks for a constructor of Boolean
Also does not convert decimal from string to a number

To Reproduce

@Entity({ name: "transaction" })
export class Transaction {
  @Column("decimal", {
    precision: 20,
    scale: 8,
  })
  public amount!: number;

  @Column("boolean")
  public hidden?: boolean = false;
}

Calling this line with entity as above returns string values for amount as well as a tinyint value for the hidden field

let t = await tranRepo.findOne({});