flatten

Undocumented in source. Be warned that the author may not have intended to support it.
  1. Option!T flatten(Option!(Option!T) o)
  2. ElementEncodingType!(R).OptionValueType[] flatten(R range)
    pure
    ElementEncodingType!(R).OptionValueType[]
    flatten
    (
    R
    )
    ()
    if (
    isInputRange!R &&
    isOptionType!(ElementEncodingType!R)
    )

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