[datatable-help] example(data.table) confusing use of "v"

[Douglas Clark]

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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