Can not load json: AttributeError: 'str' object has no attribute 'items'

[skliarie]

python3 --version

Python 3.10.12

pip3 install python-redis

...
Created wheel for python-redis: filename=python_redis-0.4.0-py2.py3-none-any.whl size=20546 sha256=7f032eb61d2b09e6c59065016b656f0522872722f9f63858e9e29e92e6ee0af8

The error

I mare redis-dump using redisdl.py like this:
./redisdl.py -H $redis_host -d 0 -E iso-8859-1 > /tmp/redis.json

Then I tried to load it and it failed with error. Here is the offending key:

# cat a.json 
{
  "GWPA:LDR:10015:event:103874": {
    "type": "zset",
    "value": [
      [
        "0",
        0.0
      ]
    ]
  }
}
# cat a.json | ./redisdl.py -l -H $redis_host -d 0 -E iso-8859-1 --empty
Traceback (most recent call last):
  File "/tmp/./redisdl.py", line 632, in <module>
    main()
  File "/tmp/./redisdl.py", line 628, in main
    do_load(options, args)
  File "/tmp/./redisdl.py", line 556, in do_load
    load(input, **kwargs)
  File "/tmp/./redisdl.py", line 466, in load
    load_lump(fp, host=host, port=port, password=password, db=db,
  File "/tmp/./redisdl.py", line 347, in load_lump
    loads(s, host, port, password, db, empty, unix_socket_path, encoding, use_expireat=use_expireat)
  File "/tmp/./redisdl.py", line 328, in loads
    _writer(r, p, key, type, value, ttl, expireat, use_expireat=use_expireat)
  File "/tmp/./redisdl.py", line 483, in _writer
    p.zadd(key, element, score)
  File "/usr/local/lib/python3.10/dist-packages/redis/commands/core.py", line 4167, in zadd
    for pair in mapping.items():
AttributeError: 'str' object has no attribute 'items'