Delimiters in the text
Plain text with {++ this ++}, {-- that --}, {~~ a ~> b ~~}, {== mark ==} and {>> note <<}.
Inserted: x {++ y ++} z --} w ~> v and deleted: .
A comment on {== text ==} here.
Split across runs: a --} and {++ and ~> end.
An insertion ending in a dash --} right after it.
Math-like text $x_{--}$ and $y^{++}$ stays.
