in lib/eventstream_rpc_utils.ts [277:285]
export function validateValueAsInteger(value : any, propertyName?: string, type?: string) {
if (value === undefined) {
throwMissingPropertyError(propertyName, type);
}
if (typeof value !== 'number' || !Number.isSafeInteger(value as number)) {
throwInvalidPropertyValueError('an integer value', propertyName, type);
}
}