dtype checking only mode[Feature Request]

[qiuwei]

Support for dtype checking alone would be useful.

e.g.

Dataset[int, str, str]

[CedricFR]

Hi @qiuwei,

Thank you for the suggestion.

What would be the use case for this? This library was developed with mainly Data Science use cases in mind, where you systematically give names to your columns anyway. Happy to hear your perspective.