This release update
The changes make this implemenation now follows version 0.28 of the CommonMark spec.
Tabs are no longer expanded to spaces, however when parsing blocks they behave like spaces with a tab stop of 4 characters.
Spaces are now stripped from the end of paragraphs so that two or more spaces will not become a hard line break.
Closing fences of fenced code blocks can now be longer than the opening fence.
Link destinations can be enclosed in an opening < and >
glibc 2.28 made some changes to the collation of Unicode characters which affect regular expression ranges. This caused the regular expression range for control characters to match charaacters it shouldn’t.