preload is invalid when use array key, Does it only work in string key ?

[vaynevayne]

 const { data } = useSWR([url,key], ([url,params]) =>
    axios.get(url,{params}),
  )

 preload(
               [url,key],
                ([url,params]) => axios.get(url,{params}),
              )

[3pleFly]

Having this issue myself...
I ended up just removing the key array unforunately,

export const usePayslips = (year: number | null) =>
useSWRImmutable<IPayslip[]>(
year ? ${PrivateEndpoints.PAYSLIP}?year=${year} : null,
{
fetcher: (url) =>
privateApi.get<IPayslip[]>(url).then((r) => r.data ?? []),
suspense: true,
}
);