py/objarray: Fix array.append so it doesn't extend if append fails.
Addresses issue #1965.
diff --git a/py/objarray.c b/py/objarray.c
index da9dd52..bafba76 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -336,7 +336,9 @@
self->items = m_renew(byte, self->items, item_sz * self->len, item_sz * (self->len + self->free));
mp_seq_clear(self->items, self->len + 1, self->len + self->free, item_sz);
}
- mp_binary_set_val_array(self->typecode, self->items, self->len++, arg);
+ mp_binary_set_val_array(self->typecode, self->items, self->len, arg);
+ // only update length/free if set succeeded
+ self->len++;
self->free--;
return mp_const_none; // return None, as per CPython
}