[Issue 9482] Option to compile in release mode, but keep in contracts on non-private functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=9482

--- Comment #2 from Stewart Gordon <smjg at iname.com> ---
At first I thought this was a Linux-specific feature - but I see now it's in
the Windows, OSX (which is called macOS now) and FreeBSD versions alike.  Any
idea when this feature was added?  Furthermore, does this switch on in
contracts for all functions, or does it exclude private functions?

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