The spec is the commonmark spec together with extensions of the type the commonmark spec was devised to make possible. People know better than to leave such a 'language' with a 'spec' that only really resides in a perl program, of all things. There are lists upon lists upon lists of corner cases the the perl does differently from every other program that, in the first years, reimplemented it. All of them show the perl does not meet the intention.

You are such a bore. Read the motivating preamble in Gruber's spec- that's the part the GFM standardization process stayed faithful to.

Up until Microsoft got involved.