fmt: String format %+d treats zero as a positive number

[mcmil]

Formatting zero using the + flag in fmt.Printf("%+d",0) results in +0 output. It seems that it is a bug, since zero is neither positive nor negative. I would expect a simple 0 as an answer.

Sample: http://play.golang.org/p/XhcQmGYXMC

[robpike]

Working as intended. As the documentation says:

+   always print a sign for numeric values

You can argue whether 0 is positive, but you can't argue that it's not numeric.