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pySim/utils: define 'Hexstr' using NewType

This means Hexstr is no longer an alias for 'str', but a distinct
new type, a sub-class of 'str'.

Change-Id: Ifb787670ed0e149ae6fcd0e6c0626ddc68880068
---
M pySim/utils.py
1 file changed, 14 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/56/33656/1

diff --git a/pySim/utils.py b/pySim/utils.py
index c6362fa..b534580 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -7,7 +7,7 @@
 import abc
 import string
 from io import BytesIO
-from typing import Optional, List, Dict, Any, Tuple
+from typing import Optional, List, Dict, Any, Tuple, NewType
 
 # Copyright (C) 2009-2010  Sylvain Munaut <tnt@246tNt.com>
 # Copyright (C) 2021 Harald Welte <laforge@osmocom.org>
@@ -27,7 +27,7 @@
 #
 
 # just to differentiate strings of hex nibbles from everything else
-Hexstr = str
+Hexstr = NewType('Hexstr', str)
 
 
 def h2b(s: Hexstr) -> bytearray:

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