Github markdown viewer fails when text contains <a

[rmzetti]

For the examples below (ordinary text, code block, pre, code & div), the same string is used. As can be seen, showdown fails in the last three cases. A numeric instead of an alphabetic character directly after the < works fine for all cases. Also note the ordinary text version also fails in the showdown jsfiddle

//ok for ordinary text for(i=1;i<a;i++){sum+=i}

  //ok in backtics
  for(i=1;i<a;i++){sum+=i}

  //fails in pre block
  for(i=1;i

/fails in code block/
for(i=1;i<a;i++){sum+=i}




 
  //fails in div
  for(i=1;i