refactor(derive): Prepare for action support #3783
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This exposed a potential bug but I figure it isn't worth fixing without actions.
This reverts commit 50f4018. This broke compatibility with the derive when dealing with `Option<Option<T>>` and related cases.
epage
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Jun 6, 2022
This is the derive support for clap-rs#3774 (see also clap-rs#3775, clap-rs#3777) This combined with `value_parser` replaces `parser`. The main frustration with this is that `ArgAction::Count` (the replacement for `parse(from_occurrences)` must be a `u64`. We could come up with a magic attribute that is meant to be the value parser's parsed type. We could then use `TryFrom` to convert the parsed type to the user's type to allow more. That is an exercise for the future. Alternatively, we have clap-rs#3792. Prep for this included - clap-rs#3782 - clap-rs#3783 - clap-rs#3786 - clap-rs#3789 - clap-rs#3793
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A lot of misc steps towards actions