✅ 📚 Add custom write function test and documen… #237

Job	Run time
build_and_test_22 (clang, 15, 20, libstdc++, Debug)	1m 34s
sanitize (address, clang)	2m 0s
build_and_test_22 (clang, 14, 20, libc++, Debug)	2m 0s
sanitize (address, gcc)	1m 53s
sanitize (thread, clang)	1m 56s
quality_checks_pass	56s
build_and_test_22 (clang, 15, 20, libc++, Debug)	2m 17s
build_and_test_24 (clang, 18, 20, libstdc++, Debug)	2m 9s
build_and_test_24 (clang, 17, 20, libc++, Debug)	2m 11s
build_and_test_24 (clang, 16, 20, libc++, Debug)	2m 10s
valgrind	2m 3s
sanitize (undefined, gcc)	2m 0s
build_and_test_24 (clang, 19, 20, libc++, Debug)	2m 23s
build_and_test_24 (clang, 19, 20, libstdc++, Debug)	2m 7s
build_and_test_24 (gcc, 14, 20, libstdc++, Debug)	1m 44s
build_and_test_24 (clang, 20, 20, libc++, Debug)	2m 36s
build_and_test_24 (gcc, 12, 20, libstdc++, Debug)	1m 37s
build_and_test_24 (clang, 20, 20, libstdc++, Debug)	2m 12s
build_and_test_24 (clang, 16, 20, libstdc++, Debug)	1m 53s
build_and_test_24 (gcc, 13, 20, libstdc++, Debug)	1m 59s
sanitize (thread, gcc)	2m 0s
build_and_test_24 (clang, 18, 20, libc++, Debug)	2m 23s
sanitize (undefined, clang)	2m 14s
build_and_test_24 (clang, 17, 20, libstdc++, Debug)	1m 58s
merge_ok	4s
	48m 19s

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