README: rephrase call

README.md

@@ -382,9 +382,10 @@ Please help us ! Feel very welcome to:
 >>> assert integers.count() == 10
 ```
 
-> ***calling*** the stream iterates over it until exhaustion.
+> ***calling*** the stream iterates over it until exhaustion and returns it.
 ```python
->>> integers.foreach(print)()
+>>> verbose_integers: Stream[int] = integers.foreach(print)
+>>> assert verbose_integers() is verbose_integers
 0
 1
 2

tests/test_readme.py

@@ -215,6 +215,10 @@ def test_zip_example(self) -> None:
     def test_count_example(self):
         assert integers.count() == 10
 
+    def test_call(self):
+        verbose_integers: Stream[int] = integers.foreach(print)
+        assert verbose_integers() is verbose_integers
+
     # fmt: off
     def test_etl_example(self) -> None: # pragma: no cover
         # for mypy typing check only