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Sometimes LangChain would insert a single `[np.nan]` as a placeholder if the embedding function failed. This causes a problem for Lance format because then the array can't be stored as a FixedSizedListArray. Instead: 1. By default we remove rows with embedding lengths less than the maximum length in the batch 2. If `strict=True` kwargs is set to True, then a `ValueError` is raised if the embeddings aren't all the same length --------- Co-authored-by: Chang She <chang@lancedb.com>