export function encodeFunctionArgument(argument: FunctionArgument, typeStr: string): EncodedFunctionArgument {
   ...

  // Redefine SIG as a bytes65 so it is included in the size checks below
  // Note that ONLY Schnorr signatures are accepted
  if (type === PrimitiveType.SIG && argument.byteLength !== 0) {
    type = new BytesType(65);
  }

  // Redefine DATASIG as a bytes64 so it is included in the size checks below
  // Note that ONLY Schnorr signatures are accepted
  if (type === PrimitiveType.DATASIG && argument.byteLength !== 0) {
    type = new BytesType(64);
  }