-CT_LOWER = $01 ; 0 - Lower case char
-CT_UPPER = $02 ; 1 - Upper case char
-CT_DIGIT = $04 ; 2 - Numeric digit
-CT_XDIGIT = $08 ; 3 - Hex digit (both, lower and upper)
-CT_CTRL = $10 ; 4 - Control character
-CT_SPACE = $20 ; 5 - The space character itself
-CT_OTHER_WS = $40 ; 6 - Other whitespace ('\f', '\n', '\r', '\t' and '\v')
-CT_SPACE_TAB = $80 ; 7 - Space or tab character
+CT_NONE = $00 ; Nothing special
+CT_LOWER = $01 ; 0 - Lower case char
+CT_UPPER = $02 ; 1 - Upper case char
+CT_DIGIT = $04 ; 2 - Numeric digit
+CT_XDIGIT = $08 ; 3 - Hex digit (both, lower and upper)
+CT_CTRL = $10 ; 4 - Control character
+CT_SPACE = $20 ; 5 - The space character itself
+CT_OTHER_WS = $40 ; 6 - Other whitespace ('\f', '\n', '\r', '\t' and '\v')
+CT_SPACE_TAB = $80 ; 7 - Space or tab character