>Looks like a bug to me but you don't have to loop through all 256 characters to show that CHR(0) is not supported by TAG property.

mmmm ,
BUT only after to have tested all the characters.

Now we know that from 0h1 to 0hFF Custom.Tag it is ok.
The rest (2 or more characters and in other classes) is a faith action.

I run the test, and copy/past it into UT.