More added type annotations; reworked Word.__init__ so that excludeChars exclusion code is clearer

1 files changed, 1 insertions, 0 deletions

diff --git a/pyparsing/testing.py b/pyparsing/testing.py
index 84a0ef1..e2dd355 100644
--- a/pyparsing/testing.py
+++ b/pyparsing/testing.py
@@ -265,6 +265,7 @@ class pyparsing_test:
         if expand_tabs:
             s = s.expandtabs()
         if mark_control is not None:
+            mark_control = typing.cast(str, mark_control)
             if mark_control == "unicode":
                 tbl = str.maketrans(
                     {c: u for c, u in zip(range(0, 33), range(0x2400, 0x2433))}