A strict unit test
SHOULD have caught your bug here in code coverage
...final important step is to analyze and maximize code coverage. We recommend that you implement a dynamic coding standard requiring that all code must have 100% line coverage upon check in to source control.
but of course still with 100%CC, bugs may slip through due to the Quis Custodiet Ipsos Custodes
(Who watches the watchmen?) problem of writing test software....
The issue of boxing
is not black/white, there is a spectrum of "grey goo" in between...
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