BitsAndBytesConfig missing a validation

[hotab]

System Info

• transformers version: 4.41.1
• Platform: Windows-11-10.0.22631-SP0
• Python version: 3.12.1
• Huggingface_hub version: 0.23.2
• Safetensors version: 0.4.3
• Accelerate version: 0.30.1
• Accelerate config: not found
• PyTorch version (GPU?): 2.3.0+cu121 (True)
• Tensorflow version (GPU?): not installed (NA)
• Flax version (CPU?/GPU?/TPU?): not installed (NA)
• Jax version: not installed
• JaxLib version: not installed
• Using GPU in script?: Yes
• Using distributed or parallel set-up in script?: No

Who can help?

@SunMarc and @younesbelkada

Information

• The official example scripts
• My own modified scripts

Tasks

• An officially supported task in the examples folder (such as GLUE/SQuAD, ...)
• My own task or dataset (give details below)

Reproduction

from transformers import BitsAndBytesConfig
cfg = BitsAndBytesConfig(
    load_in_4bit=True,
    bnb_4bit_quant_storage='add'
)

Will not fail with a validation error and will just continue as-is

Expected behavior

Failing with a ValueError, same as bnb_4bit_compute_dtype