envflag.go
func Uint(name string, value uint, usage string) *uint {
	return EnvironmentFlags.Uint(name, value, usage)
}
func Uint(name string, value uint, usage string) *uint {
	return EnvironmentFlags.Uint(name, value, usage)
}
// Uint defines a uint flag with specified name, default value, and
// usage string.  The return value is the address of a uint variable
// that stores the value of the flag.