Untabify optimized (under profiler 255ms -> 15ms for 50 iterations on spec.txt)
Untabify optimized (under profiler 255ms -> 15ms for 50 iterations on spec.txt)

lostfictions/CommonMark.NET,laedit/CommonMark.NET,Mosoc/CommonMark.NET,laedit/CommonMark.NET,AMDL/CommonMark.NET,dut3062796s/CommonMark.NET,Mosoc/CommonMark.NET,AMDL/CommonMark.NET,dudb/CommonMark.NET,lostfictions/CommonMark.NET,dut3062796s/CommonMark.NET,dudb/CommonMark.NET