Is there a reliable way to check if an object is a vector?

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I'm want to check if a given sage object obj is a vector or not. I'd like to do this as efficiently as possible. Currently my best idea is:

sage_input(obj).__repr__().startswith('vector')

This works, assuming that sage_input is smart enough to identify every vector without false positives. However, this solution feels inefficient (and also inelegant!). Is there a better way?