`int` with `arg:"env"` results in `strconv.ParseInt: parsing "": invalid syntax` if environment variable is empty

[nyetwurk]

Not sure what it should do instead, since there is no NaN for integers.

Maybe allow *int which would result in nil?

Easiest would be to treat it as if it was undefined.

[alexflint]

Yes I do think that an empty environment variable should result in the zero value, not an error. I may be able to look into this in next few weeks. Thank you for the report.

[dyfet]

Should not the default value have taken effect if the env variable is empty?