- updated dcos that the test runner now replaced 0x00 with the utf8 ballot box character

readme.md

@@ -483,7 +483,9 @@ The (Test) Runner executes the command that was passed to it from the (Test) Ser
 It is normally used to execute the users program and sandbox the execution.
 
 ## Important
-the test runner needs to replace every 0x00 character (\u0000 / (char)0) from the test protocol with the empty string/char else some databases will not be able to store the protocol
+the test runner needs to replace every 0x00 character (\u0000 / (char)0) from the test protocol with another symbol else some databases will not be able to store the protocol
+
+The replacement symbol should be ☐ (\u2610 or 0xE2 0x98 0x90 or ballot box) because this looks like a encoding error (and this is almost correct)
 
 compile/execute commands #x args (see Ref 1)