A separate style offered by Class::Meta as noted in doc:

The boolean data type is the only one that uses a slightly different approach to the creation of affordance accessors: It creates three of them. Assuming you're creating a boolean attribute named "alive", it will create these accessors:

  sub is_alive      { shift->{alive} }
  sub set_alive_on  { shift->{alive} = 1 }
  sub set_alive_off { shift->{alive} = 0 }
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Suggested accessor style name is 'bool' or 'boolean'.