more takeout tweaks and comments

tests/takeout.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+from itertools import islice
+
+from my.core.cachew import disable_cachew
+disable_cachew()
+
+import my.location.takeout as LT
+
+
+def ilen(it):
+    # TODO more_itertools?
+    return len(list(it))
+
+
+def test_location_perf():
+    # 2.80 s for 10 iterations and 10K points
+    # TODO try switching to jq and see how it goes? not sure..
+    print(ilen(islice(LT.iter_locations(), 0, 10000)))