There are very few pieces of free software that don't lean very heavily on top of a mountain of other free software that make it possible, and I think the author would be surprised how much of that was written by people who strongly disagreed with his worldview and considered him a "bad guy".
See also the "lite assertions" mode @ https://gcc.gnu.org/wiki/LibstdcxxDebugMode for glibc, however these are less well documented and it's less clear what performance impact these measures are expected to have.
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