_getFormAutoNumericChildren(formElement) {
        // Search for all the child AutoNumeric elements in that parent form
        const inputElementsList = [...formElement.elements]; //XXX `.elements` here only returns the form's inputs, not the other child elements that could be contenteditable
        const nonInputContentEditableElementsList = this._getContenteditableElements(formElement); // Get the contenteditable elements inside and outside the form element
        const elementsList = AutoNumericHelper.arrayUnique(inputElementsList, nonInputContentEditableElementsList);

        return elementsList.filter(element => this.constructor.isManagedByAutoNumeric(element));
    }
Returns an array of the AutoNumeric-managed elements for the given form element is passed, otherwise for the current `this.parentForm` element.
This search for <input> elements, as well as contenteditable non-input tag ones. This also search for elements outside the `form` elements.

@param {HTMLFormElement|null} formElement

@returns {Array.<HTMLInputElement>}
@private