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Standard error of the Spearman rank correlation coefficient in Quantopian's tearsheet

In factor_spearman_rank_IC of the Factor Tear Sheet, the following function is defined:

    def src_std_error(rho, n):  
        return np.sqrt((1-rho**2)/(n-2))  

I'm curious: What is this the standard error of? According to the wikipedia page about the Spearman coefficient, the standard error of the conventional Spearman rank coefficient ought to be 0.6325/np.sqrt(n-1)