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Nate Cook
a9b9644153
When a property wrapper is applied to a property, the property's storage is given a name with a prefixed underscore. That is, for a property named `x`, the actual storage is named `_x`. That prefixed storage is what is visible through reflection, so when building an ArgumentSet from a command type's Mirror, we need to remove the leading underscore. This is done when creating an InputKey for each property. However, InputKeys are also created from CodingKeys during decoding of a ParsableCommand. These CodingKeys _do not_ have the leading underscore that is visible, so any underscores that appear are actually from the declaration of the property with an underscored name. Removing leading underscores from CodingKey names results in a mismatch when trying to find the decoded value. This change simplifies the InputKey type to use an array path instead of an indirect enum and removes the leading underscore dropping when creating an InputKey from a CodingKey. rdar://104928743