[Typescript] SchemaType.cast (non static) probably has wrong type

[hasezoey]

Do you want to request a feature or report a bug?
types

What is the current behavior?
it seems like SchemaType.cast has value "Function" and wants an "Function" to be returned (plainly speaking)

mongoose/index.d.ts

Lines 2472 to 2489 in abf7b02

	class SchemaType {
	/** SchemaType constructor */
	constructor(path: string, options?: any, instance?: string);
	/** Get/set the function used to cast arbitrary values to this type. */
	// eslint-disable-next-line @typescript-eslint/ban-types
	static cast(caster?: Function | boolean): Function;
	static checkRequired(checkRequired?: (v: any) => boolean): (v: any) => boolean;
	/** Sets a default option for this schema type. */
	static set(option: string, value: any): void;
	/** Attaches a getter for all instances of this schema type. */
	static get(getter: (value: any) => any): void;
	/** Get/set the function used to cast arbitrary values to this type. */
	cast(caster: (v: any) => any): (v: any) => any;

If the current behavior is a bug, please provide the steps to reproduce.

so things like the following dont work:

class CustomInt extends mongoose.SchemaType {
  constructor(key: string, options: any) {
    super(key, options, 'CustomInt');
  }

  public cast(val) { // Error: Type 'number' is not assignable to type '(v: any) => any'
    return Number(val);
  }
}

and as an example, SchemaNumber has 3 parameters listed, which are not typed:

mongoose/lib/schema/number.js

Lines 342 to 351 in abf7b02

	/**
	* Casts to number
	*
	* @param {Object} value value to cast
	* @param {Document} doc document that triggers the casting
	* @param {Boolean} init
	* @api private
	*/
	SchemaNumber.prototype.cast = function(value, doc, init) {

What is the expected behavior?

the provided example to not error and have correct types

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
5.11.18

---

am i just maybe using the wrong type to extend from?