[Issue 21151] div bug: long -5000 / size_t 2 = 9223372036854773308

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21151

--- Comment #12 from mw <mingwu at gmail.com> ---
for the additional reference, the forum discussion is here:

https://forum.dlang.org/thread/rdrqedmbknwrppbfixll@forum.dlang.org

Now both Java and C# did it more correct than D.


"""
At least I want a warning message, even with a turn-on command-line switch is
fine, I personally will turn it on all the time, silently performing this
conversions is horrible.



In many area of the language design, we need to make a choice between: 
correctness v.s. raw performance.

But at least we also need *explicit* visible warning message after we've made
that choice:

-- especially warnings about *correctness* when the choice was made favoring
performance
-- if the choice was made favoring correctness, user will notice the
performance when the program runs.


Personally, I will favor correctness over performance in my program design
decisions: make it correct first, and faster later; you never know before-hand
where your program's bottleneck is.

I'm sure you know the famous quote:

"Premature optimization is the root of all evil!"

"""

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