Clarified that version tag components aren't sent over the wire.

Version tag components are only useful for development work and
pre-releases. They are important for ensuring daemon API compatibility,
but they aren't useful for ensuring compatibility with endpoints.

pkg/mutagen/version.go

@@ -39,6 +39,7 @@ func init() {
 type versionBytes [12]byte
 
 // SendVersion writes the current Mutagen version to the specified writer.
+// Version tag components are neither transmitted nor received.
 func SendVersion(writer io.Writer) error {
 	// Compute the version bytes.
 	var data versionBytes
@@ -51,7 +52,8 @@ func SendVersion(writer io.Writer) error {
 	return err
 }
 
-// ReceiveVersion reads version information from the specified reader.
+// ReceiveVersion reads version information from the specified reader. Version
+// tag components are neither transmitted nor received.
 func ReceiveVersion(reader io.Reader) (uint32, uint32, uint32, error) {
 	// Read the bytes.
 	var data versionBytes
@@ -69,7 +71,9 @@ func ReceiveVersion(reader io.Reader) (uint32, uint32, uint32, error) {
 }
 
 // ReceiveAndCompareVersion reads version information from the specified reader
-// and ensures that it matches the current Mutagen version.
+// and ensures that it matches the current Mutagen version. Version tag
+// components are neither transmitted nor received, so they do not enter into
+// this comparison.
 func ReceiveAndCompareVersion(reader io.Reader) (bool, error) {
 	// Receive the version.
 	major, minor, patch, err := ReceiveVersion(reader)