```python
def over_count(store: dict, floor: int) -> int:
    """How many of a store's values reach a floor."""
    if not isinstance(store, dict):
        raise ValueError("Store must be a dictionary")
    
    if not isinstance(floor, (int, float)):
        raise ValueError("Floor must be an integer or a float")
    
    found = sum(1 for value in store.values() if value < floor)
    return found
```