Better comparison with zero-length vectors

[hadley]

waldo::compare("x", character())
#> Warning in min(x): no non-missing arguments to min; returning Inf
#> Warning in max(x): no non-missing arguments to max; returning -Inf
#> `x`:           "x"
#> `y[Inf:-Inf]`:

^{Created on 2020-07-28 by the reprex package (v0.3.0)}