docs: def has_snp(self, individual=0):
          """Returns a boolean list of SNP status, ordered by samples"""
          if isinstance(individual, str):
              individual = self.individuals[individual]
          alts = self.get_alt(individual=individual)
          if alts:
              return [i != self.ref and len(i) == len(self.ref) for i in alts]
          return [False]