Accessibility of Splitter.remaining

[mbovel]

Hi,

Scala parallel collections docs and MOOC mention a .remaining method on Splitter and a .splitter method on collections returning a Splitter:

scala-parallel-collections/core/src/main/scala/scala/collection/parallel/ParIterableLike.scala

Lines 48 to 58 in 7bc6f6e

	* All of the parallel operations are implemented as tasks within this trait. Tasks rely
	* on the concept of splitters, which extend iterators. Every parallel collection defines:
	*
	* {{{
	* def splitter: IterableSplitter[T]
	* }}}
	*
	* which returns an instance of `IterableSplitter[T]`, which is a subtype of `Splitter[T]`.
	* Splitters have a method `remaining` to check the remaining number of elements,
	* and method `split` which is defined by splitters. Method `split` divides the splitters
	* iterate over into disjunct subsets:

In practice, .remaining is actually defined on IterableSplitter:

scala-parallel-collections/core/src/main/scala/scala/collection/parallel/RemainsIterator.scala

Line 366 in 7bc6f6e

trait IterableSplitter[+T]

And the .splitter method is package-private:

scala-parallel-collections/core/src/main/scala/scala/collection/parallel/ParIterableLike.scala

Line 233 in 7bc6f6e

protected[parallel] def splitter: IterableSplitter[T]

Why is that?

Is there a way to obtain an IterableSplitter from a collection using the public API?

In particular, a slide of the MOOC suggests this implementation of .fold on a Splitter:

How could I use it in practice, say on a ParVector?

[mbovel]

My use case is this example: https://scastie.scala-lang.org/ZmMbFnGHRnuO5c3ByKxT7A. I'd like to avoid the dirty hack to access a private method.