fix: make from_iter require iterables

src/awkward/operations/ak_from_iter.py

@@ -1,6 +1,8 @@
 # BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
 __all__ = ("from_iter",)
 
+from collections.abc import Iterable
+
 from awkward_cpp.lib import _ext
 
 import awkward as ak
@@ -72,6 +74,13 @@ def from_iter(
 
 
 def _impl(iterable, highlevel, behavior, allow_record, initial, resize):
+    if not isinstance(iterable, Iterable):
+        raise ak._errors.wrap_error(
+            TypeError(
+                f"cannot produce an array from a non-iterable object ({type(iterable)!r})"
+            )
+        )
+
     if isinstance(iterable, dict):
         if allow_record:
             return _impl(
@@ -89,6 +98,7 @@ def _impl(iterable, highlevel, behavior, allow_record, initial, resize):
                 )
             )
 
+    # Ensure that tuples are treated as iterables, not records
     if isinstance(iterable, tuple):
         iterable = list(iterable)