@ypercubeᵀᴹ I put in your answer as a community wiki - removed my dog's (ahem... err... ahh) "dinner" of an answer. I did a performance analysis - you're no. 2 after Quassnoi, so not too bad? I answered the
"decimal point" - I did put a lot of work in - went down many rabbit holes! :-) Got a correct answer tick for my troubles! Any input would be appreciated.