[feature] random.unpredictableSeed, from pid, threadid, time

[timotheecour]

same as https://dlang.org/library/std/random/unpredictable_seed.html

EDIT
just figured that nim has this:

proc randomize*() {.benign.} =
    let now = times.getTime()
    randomize(convert(Seconds, Nanoseconds, now.toUnix) + now.nanosecond)

this could be improved for more randomness, as done here: https://github.com/dlang/phobos/blob/v2.081.1/std/random.d#L1549
which mixes pid, threadid, and time

if (!seeded)
        {
            uint threadID = cast(uint) cast(void*) Thread.getThis();
            rand.seed((getpid() + threadID) ^ cast(uint) MonoTime.currTime.ticks);
            seeded = true;
        }
        rand.popFront();
        return cast(uint) (MonoTime.currTime.ticks ^ rand.front);

minor

• would be good to update docs because randomize doesn't appear next to randomize(seed), and its docstring doesn't contain seed, so its easy to miss.

[narimiran]

I don't see any significant benefit of "more randomness". Closing as rejected.