[Issue 11188] std.math.abs fails for shared BigInt type

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https://issues.dlang.org/show_bug.cgi?id=11188

--- Comment #11 from anonymous4 <dfj1es...@sneakemail.com> ---
I think concurrency support is unreasonable here (and lacks rationale and use
case). How it would work? Create a mutex for every BigInt?

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