Take slices by reference. #999

Job	Run time
C++ Clang 9 (Ubuntu 20.04)	1m 37s
C++ Clang 10 (Ubuntu 20.04)	1m 37s
C++ Clang 13 (Ubuntu 22.04)	1m 36s
C++ Xcode (macOS)	3m 57s
C++ Clang 11 (Ubuntu 20.04)	1m 40s
C++ GCC 6 (Ubuntu 20.04)	1m 30s
C++ Clang 14 (Ubuntu 22.04)	1m 31s
C++ Clang 12 (Ubuntu 20.04)	1m 36s
C++ GCC 7 (Ubuntu 20.04)	1m 38s
C++ Clang 15 (Ubuntu 22.04)	1m 31s
C++ GCC 11 (Ubuntu 22.04)	1m 44s
C++ GCC 8 (Ubuntu 20.04)	1m 47s
C++ Clang 16 (Ubuntu 22.04)	1m 39s
C++ MSVC (Windows) (windows-latest)	4m 1s
C++ GCC 9 (Ubuntu 20.04)	1m 31s
C++ Clang 17 (Ubuntu 22.04)	1m 30s
C++ GCC 10 (Ubuntu 20.04)	1m 36s
C++ GCC 12 (Ubuntu 22.04)	1m 42s
C++ GCC 13 (Ubuntu 22.04)	1m 41s
C# 8.0.x	2m 51s
Java 8 (ubuntu-22.04)	1m 31s
Rust stable	52s
Java 8 (windows-latest)	2m 29s
Rust beta	47s
Java 17 (ubuntu-22.04)	1m 36s
Rust nightly	1m 13s
Java 17 (windows-latest)	2m 31s
Java 21 (ubuntu-22.04)	1m 39s
Java 21 (windows-latest)	2m 31s
	53m 24s

Provide feedback