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Problem: Crash when using garbagecollect() in between rand().
Solution: Redesign the rand() and srand() implementation. (Yasuhiro
Matsumoto, closes vim/vim#5587, closes vim/vim#5588)
https://github.com/vim/vim/commit/4f645c54efe33d7a11e314676e503118761f08a7
Omit test_srand_seed.
Unmacroify SHUFFLE_XOSHIRO128STARSTAR and SPLITMIX32 while we're at it (leave
ROTL alone as it's fairly innocent).
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Problem: No test with wrong argument for rand().
Solution: Add a test case.
https://github.com/vim/vim/commit/68e9e5f7fccb8038cf0ca5b5d95c85a923152f46
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Problem: rand() does not use the best algorithm.
Solution: use xoshiro128** instead of xorshift. (Kaito Udagawa,
closes vim/vim#5279)
https://github.com/vim/vim/commit/f8c1f9200c4b50969a8191a4fe0b0d09edb38979
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Problem: Using time() for srand() is not very random.
Solution: use /dev/urandom if available
https://github.com/vim/vim/commit/07e4a197953d12902fb97beb48830a5323a52280
Use os_open and os_close.
time_settime is N/A, so some parts of the test are disabled.
There's maybe a very, very, very, very small chance the /dev/urandom test fails,
but it shouldn't matter. :P
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Problem: Random number generator in Vim script is slow.
Solution: Add rand() and srand(). (Yasuhiro Matsumoto, closes vim/vim#1277)
https://github.com/vim/vim/commit/06b0b4bc27077013e9b4b48fd1d9b33e543ccf99
Add missing method call usage to builtin.txt.
vim_time and test_settime is N/A.
Add a modeline to test_random.vim.
Use typval_T* over listitem_T* vars so we don't need to use TV_LIST_ITEM_TV all
over the place...
Remove NULL list checks (tv_list_len covers this).
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