option('extension_set',
  type: 'combo',
  choices: ['classic', 'default', 'all'],
  value: 'default',
  description: 'Predefined sets of extensions'
)

option('enable_extensions',
  type: 'array',
  value: [],
  description: 'Comma separated list of extensions to enable instead of a predefined set.'
)

option('classic_mode',
  type: 'boolean',
  value: false,
  description: 'Enable installing data files for classic mode.'
)