diff --git a/EXIF.py b/EXIF.py
index 1999a55..19d6874 100755
--- a/EXIF.py
+++ b/EXIF.py
@@ -118,7 +118,7 @@ def main(args) -> None:
             value = data[field]
             try:
                 if args.builtin_types:
-                    logger.info('%s: %s', field, value)
+                    logger.info('%s (%s): %r', field, type(value).__name__, value)
                 else:
                     logger.info('%s (%s): %s', field, FIELD_TYPES[value.field_type][2], value.printable)
             except:
diff --git a/exifread/serialize.py b/exifread/serialize.py
index ff52544..9889ea5 100644
--- a/exifread/serialize.py
+++ b/exifread/serialize.py
@@ -50,8 +50,8 @@ def convert_types(exif_tags: dict) -> dict:
 
         # Undefined
         elif code == 'U':
-            # These contain bytes represented as a list of integers
-            out = bytes(ifd_tag.values)
+            # These contain bytes represented as a list of integers, sometimes with surrounding space/null bytes
+            out = bytes(ifd_tag.values).strip(b' \x00')
 
             # Empty byte sequences or unicode values should be decoded as strings
             try: