In the *Example* section of data.table-package documentation, `v` is used as a column name, and later a variable `v`<-"X" is defined and used in setkeyv(DT,v) to set the key to column `x`. Then `v` is again used as column name. This is confusing to me. Is the double use of `v` as both column name and variable intentional? See the extract of the Examples section below:
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