Re: 100% code coverage testing
Code coverage testing = (# lines of code tested) / (# lines of code present) x 100%.
But the bidi "bug" or transmutation of code can change the number of lines by (a) commenting them out invisibly to the developer and/or (b) rendering them unreachable, also invisibly to the developer.
Hence my "...oh". The metric is...ummm....not reliable to detect the bidi bug(s), as the "code" might not be. And if you use a different tool than the compiler to measure it, well, then you have two problems.
(I had previously submitted a lengthier reply, but once it got past El Reg's Perly gates, it seems to have fallen onto the floor of the second level of Hell, only to be lost and near forgotten.)