backup form validation function int

/**
 * Adds an error if the value is not a number
 * @param {String} customError custom error message, overrides default message
 */
export function isPositiveInt(customError){
    return (input) => {
        if(! Number.isInteger(input)){
            addToErrors(input, `${input} is not a valid Integer`, customError)
        }
        else if(input < 0){
            addToErrors(input, `${input} is not a positive number`, customError);
        }
    }
}