// sound comparisons. Use golang.org/x/text/secure/precis for string comparisons
// where security aspects are a concern.
func Fold(opts ...Option) Caser {
	return Caser{makeFold(getOpts(opts...))}
}

// An Option is used to modify the behavior of a Caser.
type Option func(o options) options

// TODO: consider these options to take a boolean as well, like FinalSigma.