ExtraParameter ErrorCode is never set

[tardypad]

It seems that the ErrorCode ExtraParameter "a value was set to a long flag" is never being set.

The related function extraArg is referenced nowhere

getopt/v2/error.go

Line 75 in 6173d3f

func extraArg(o Option, value string) *Error {

Testing setting a value to a long boolean flag returns the error "invalid value for bool" with the Invalid ErrorCode

getopt/bool.go

Line 21 in 6173d3f

return fmt.Errorf("invalid value for bool %s: %q", opt.Name(), value)

[tardypad]

Btw while checking the code, I found some typos in that error.go file

getopt/v2/error.go

Line 34 in 6173d3f

return "unknow option"

getopt/v2/error.go

Line 38 in 6173d3f

return "unxpected value"

getopt/v2/error.go

Line 64 in 6173d3f

// a required paramter.

and more of this one below