Currently this is just a wrapper around github.com/segmentio's 2 fast case parses:
github.com/segmentio/go-camelcase
github.com/segmentio/go-snakecase
With an added Pascal Case function:
func CamelCase(str string) string
func SnakeCase(str string) string
func PascalCase(str string) string
Thank you @tj for switching to Go just before we did! ;)