Feasibility of a Span class in java

[Red IO]

Following the development and plans for both Panama's memory access api and
the required changes provided by Valhalla while looking at c#'s directions
for the last few years I was wondering if writing a class that serves as a
universal and easy-to-use interface for accessing memory of all sorts of
"value based" types inspired by c#' s Span struct would be beneficial for
Java. Of course this assumes the completion of the memory api (panama) ,
the generic unification (Valhalla) and custom value based types (Valhalla).
The idea is to speed up array and string manipulation by using short lived
slicing objects (Span). I already wrote a poorly implemented slicer for
strings and saw incredible performance gains in comon operations like
substring and split.
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