vavr is a functional programming library for the JVM.Collector that accumulates 0 or 1 input elements into an Option<T>.MapEntryMappers but map entries in vavr are in fact
of type Tuple2Option, ...)
supports vavr collections via ResultBearing.collectInto(Type) call
supports key-value mappings of a tuple result (implicitly used by map collectors)
supports tuple projection
supports column mapping for Option
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