NavigableSubMap.headMap

Undocumented in source. Be warned that the author may not have intended to support it.
  1. alias headMap = NavigableMap!(K, V).headMap
  2. SortedMap!(K, V) headMap(K toKey)
    class NavigableSubMap(K, V)
    final
    SortedMap!(K, V)
    headMap
    ()

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