VersionTLS13,
	VersionTLS12,
	VersionTLS11,
	VersionTLS10,
}

// roleClient and roleServer are meant to call supportedVersions and parents
// with more readability at the callsite.
const roleClient = true
const roleServer = false

var tls10server = godebug.New("tls10server")

func (c *Config) supportedVersions(isClient bool) []uint16 {