[Rd] transform.data.frame() ignores unnamed arguments when no named argument is provided

[Antoine Fabri]

Thanks and good point about unspecified behavior. The way it behaves now
(when it doesn't ignore) is more consistent with data.frame() though so I
prefer that to a "warn and ignore" behaviour:

data.frame(a = 1, b = 2, 3)

#>   a b X3

#> 1 1 2  3


data.frame(a = 1, 2, 3)

#>   a X2 X3

#> 1 1  2  3


(and in general warnings make for unpleasant debugging so I prefer when we
don't add new ones if avoidable)


playing a bit more with it, it would make sense to me that the following
have the same output:


coefficient <- 3


data.frame(value1 = 5) |> transform(coefficient, value2 = coefficient *
value1)

#>   value1 X3 value2

#> 1      5  3     15


data.frame(value1 = 5, coefficient) |> transform(value2 = coefficient *
value1)

#>   value1 coefficient value2

#> 1      5           3     15

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