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editor<-line_number
editor <-line_number: index=[int] -> line=int
1-based line-number of index. If index is omitted, editor<-caret is used as default. The line-numbers returned refers to the physical line number. In other words, the returned number is the number of LF (Line-Feed) characters from the start of the buffer to index plus one.

This numbering is conventionally used by programming languages.

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