tcomment#TypeExists(name, ...): takes a mode as optional second argument
R comments: Properly set cend to col('$')
s:StartPosRx(), s:EndPosRx(): Ignore lnum in I mode
s:StartColRx(): Takes a col as second argument
Renamed g:tcommentBlankLines to g:tcomment#blank_lines (can be 0, 1, 2)
s:GetCustomCommentString(): Take into account whether a custom comment style is defined for block & inline comments
g:tcomment#rstrip_on_uncomment: Remove right-hand whitespace on uncomment
Use a loop, not :s
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