The delivered stopword file cc_all.stp has the following character class definitions:
AL="\u0041-\u005A\u0061-\u007A\u00E0- \u00FE\u0021\u0023-\u0026\u0028- \u002B\u002D\u002F\u0030-\u0039\u003A- \u0040\u002C\u002E\u005B-\u0060\u007B-\u007E"
DI=""
DJ=""
This translates to:
AL contains all letters, digits, and punctuation including supplemental text characters except "\"".
DI contains nothing.
DJ contains nothing.
AJ still contains the '.
AC still contains the supplemental punctuation characters.