5 bug use of aligned textgridinterleave class changes changes class definition causing bugs when iterating

pyproject.toml

@@ -9,7 +9,7 @@ packages = [{include = "fave_syllabify", from = "src"}]
 
 [tool.poetry.dependencies]
 python = "^3.10"
-aligned-textgrid = "^0.6.3"
+aligned-textgrid = "^0.6.6"
 
 [tool.poetry.group.dev.dependencies]
 jupyter = "^1.0.0"

tests/test_syllabify.py

@@ -1,5 +1,5 @@
 import pytest
-from aligned_textgrid import AlignedTextGrid, custom_classes
+from aligned_textgrid import AlignedTextGrid, custom_classes, Word, Phone
 from fave_syllabify import syllabify_tg
 from pathlib import Path
 
@@ -31,4 +31,28 @@ def test_syllabify():
     for p in phones:
         if len(syl.label)>0:
             assert p.within.label in ["onset", "nucleus", "coda"]
-
+
+
+def test_syllabify_iter():
+
+    tg_path = Path("tests", "data", "aligned", "words.TextGrid")
+
+    entry_classes = classes = custom_classes(["Word", "Phone"])
+
+    tg1 = AlignedTextGrid(
+        textgrid_path=tg_path,
+        entry_classes= entry_classes
+    )
+
+    tg2 = AlignedTextGrid(
+        textgrid_path=tg_path,
+        entry_classes= entry_classes
+    )
+
+    syllabify_tg(tg1)
+
+    assert entry_classes[0].subset_class is entry_classes[1]
+    assert not tg1[0].Word.subset_class is entry_classes[1]
+
+    syllabify_tg(tg2)
+