https://www.scala-lang.org/api/2.13.x/scala/jdk/FunctionWrappers$$RichDoubleToLongFunctionAsFunction1.html
Scala Standard Library 2.13.18 - scala.jdk.FunctionWrappers.RichDoubleToLongFunctionAsFunction1
Scala Standard Library 2.13.18 - scala.jdk.FunctionWrappers.RichDoubleToLongFunctionAsFunction1
standard libraryscalajdkfunctionwrappers