AI Dev Tool: Excel now supports multiple

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Preview Code

```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS with Excel Multi-Value Support
# Description: A production-ready FastAPI Pydantic v2 Micro-SaaS boilerplate with support for Excel's new multiple values in a single cell feature.

from fastapi import FastAPI, Depends, HTTPException
from pydantic import BaseModel, validator
from typing import List, Optional
import pandas as pd
from io import BytesIO

app = FastAPI()

# Define a Pydantic model to handle Excel file uploads
class ExcelFile(BaseModel):
    file: bytes

    @validator('file')
    def validate_file(cls, v):
        try:
            # Attempt to read the Excel file using pandas
            pd.read_excel(BytesIO(v))
            return v
        except Exception as e:
            raise HTTPException(status_code=400, detail=f"Invalid Excel file: {str(e)}")

# ... full runnable version includes tests & documentation