add note for non-blocking file descriptor used for json_loadfd
@@ -1333,7 +1333,11 @@ If no error or position information is needed, you can pass *NULL*.
It is important to note that this function can only succeed on stream
file descriptors (such as SOCK_STREAM). Using this function on a
non-stream file descriptor will result in undefined behavior. For
- non-stream file descriptors, see instead :func:`json_loadb()`.
+ non-stream file descriptors, see instead :func:`json_loadb()`.In
+ addition, please also note that this function cannot be used on
+ non-blocking file descriptors (such as non-blocking socket). Using
+ this function on non-blocking file descriptors has a high risk of
+ data loss because it does not support resuming.
This function requires POSIX and fails on all non-POSIX systems.
