- Add an `--accessible` option to the default set of `@extra_command` and `@extra_group` (via `default_extra_params()`). Enabling it, or setting the `ACCESSIBLE` environment variable, is equivalent to `--no-color --table-format plain`: it strips ANSI codes and renders tables without Unicode box-drawing characters, for screen readers. An explicit `--color` or `--table-format` (on the command line or in a configuration file) keeps precedence. Also available as the `@accessible_option` decorator and the `AccessibleOption` class.
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