Could not serialize message in js actor

I have a pretty simple record and function in my IDL that looks like:

const record = IDL.Record({
    'a' : IDL.Vec(IDL.Nat),
    'b' : IDL.Principal,
    'c' : IDL.Nat,
'function' : IDL.Func([record], [Result_10], []),

yet when I try to call the function with an actor with

                a: [BigInt(0), BigInt(1)]
                b: principal,
                c: BigInt(10),

I get an error that Error: Could not serialize message.. I remember the actor working without an array of bigints. Is there something I’m doing wrong with the bigint array?