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Argument structs can define Description() and Epilogue(), which are added to the usage string
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Subcommands can have multiple aliases like this:
var args struct {
Remove *struct{} `arg:"subcommand:remove|rm|r" help:"remove something from somewhere"`
}-
Improves formatting of usage string when the placeholder tag is set to empty string
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Do not handle --version when the args struct lacks a Version() function
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Add StructSubcommands to Config struct