Error when call `generateObjectV2`

[darwintree]

Describe the bug

If generateObjectV2 is used, the passed modelClass is not processed appropriately and would produce a bug.

trimTokens receive the parameters models which is expected to be strings like gpt-4o. However, in generateObjectV2, modelClass, which is supposed to be small, "medium" or "large" is provided.

context = await trimTokens(context, max_context_length, modelClass);

export function trimTokens(context, maxTokens, model) {
    // Count tokens and truncate context if necessary
    const encoding = encoding_for_model(model as TiktokenModel);
    let tokens = encoding.encode(context);
    const textDecoder = new TextDecoder();
    if (tokens.length > maxTokens) {
        tokens = tokens.reverse().slice(maxTokens).reverse();

        context = textDecoder.decode(encoding.decode(tokens));
    }
    return context;
}

Screenshots

Additional context

[darwintree]

A relating PR is created #445

[monilpat]

Feel free to close this :)