docs: def maf(genotypes):
      """Computes the MAF and returns a boolean indicating if the minor allele
      is currently the coded allele.
  
      """
      warnings.warn("deprecated: use 'Genotypes.maf'", DeprecationWarning)
      g = genotypes.genotypes
      maf = np.nansum(g) / (2 * np.sum(~np.isnan(g)))
      if maf > 0.5:
          maf = 1 - maf
          return maf, False
  
      return maf, True