Cleanup "byte" vs "char" meaning just a little bit

app/tokenize/tokenize.go

 	}
 }
 
-func (self *reader) peekByte() (byte, bool) {
+func (self *reader) peekChar() (byte, bool) {
 	self.checkPos()
 	if self.done() {
 		return 0, false
 	rdr := reader{data: str}
 	b := make_builder()
 	for {
-		this_byte, ok := rdr.peekByte()
+		this_char, ok := rdr.peekChar()
 		if !ok {
 			break
 		}
-		switch this_byte {
+		switch this_char {
 		case ' ':
 			b.bufCommit()
 			rdr.tossUntilNeitherOf(" \t\n")
 			new_chars := rdr.takeChar()
 			b.bufAppend(new_chars)
 		default:
-			b.bufAppendChar(this_byte)
+			b.bufAppendChar(this_char)
 			rdr.tossChar()
 		}
 	}