bpo-29030: Document interaction between *choices* and *metavar*. (GH-23884)
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@ -1152,6 +1152,11 @@ Any container can be passed as the *choices* value, so :class:`list` objects,
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Use of :class:`enum.Enum` is not recommended because it is difficult to
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control its appearance in usage, help, and error messages.
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Formatted choices overrides the default *metavar* which is normally derived
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from *dest*. This is usually what you want because the user never sees the
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*dest* parameter. If this display isn't desirable (perhaps because there are
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many choices), just specify an explicit metavar_.
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required
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^^^^^^^^
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