Issue Description

if a field is defined as Union like 1 | 2 | 3 or 'foo' | 'bar', operators LessThan, MoreThan, etc. raises a type error.

code example:

import { Entity, Column, getConnection, LessThan } from "typeorm";

type ValueType = 1 | 2 | 3;

@Entity()
export class User {
  @Column()
  foo: ValueType;
}

const repository = getConnection().getRepository(User);

const value = 3 as ValueType;

repository.findBy({
  foo: LessThan(value)
});

Expected Behavior

works as if the field is defined as number

Actual Behavior

Type 'FindOperator<1 | 2 | 3>' is not assignable to type '1 | 2 | 3 | FindOperator<1> | FindOperator<2> | FindOperator<3> | undefined'.
  Type 'FindOperator<1 | 2 | 3>' is not assignable to type 'FindOperator<1>'.
    Type '1 | 2 | 3' is not assignable to type '1'.
      Type '2' is not assignable to type '1'.ts(2322)

Steps to Reproduce

CodeSandbox

My Environment

Additional Context

Relevant Database Driver(s)

Are you willing to resolve this issue by submitting a Pull Request?

• ✅ Yes, I have the time, and I know how to start.
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• ✖️ No, I don’t have the time and I’m okay to wait for the community / maintainers to resolve this issue.