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alias StriplinePattern

(alias) StriplinePattern = (`prune|`prune|`prune|`retain|`retain|`collapse)
    | `prune -- and collapse`
    | `prune -- and no empty`
    | `prune -- and to space`
    | `retain -- and collapse`
    | `retain -- and no empty`
    | `collapse -- all`

https://github.com/latex3/lualibs/blob/a86c5cdf063692ff7d31da439bddd88c1a3ec0c9/lualibs-util-str.lua#L294-L304