topk().list decodes "infinity" as float

[gotmog]

Version: 5.2.1

Platform: Python 3.13.2

Expected behavior

Calling topk().list() on a topk structure containing the string "infinity" should include the string "infinity" in the results.

>>> import redis as r
>>> redis = r.Redis()
>>> redis.topk().reserve("foo", 10, 20, 20, 0.9)
True
>>> redis.topk().add("foo", "infinity")
[None]
>>> redis.topk().list("foo")
["infinity"]
>>> type(redis.topk().list("foo")[0])
<class 'str'>

Actual behavior

The string "infinity" gets decoded as an inf float value.

>>> import redis as r
>>> redis = r.Redis()
>>> redis.topk().reserve("foo", 10, 20, 20, 0.9)
True
>>> redis.topk().add("foo", "infinity")
[None]
>>> redis.topk().list("foo")
[inf]
>>> type(redis.topk().list("foo")[0])
<class 'float'>

[vladvildanov]

Thanks for reaching out! We will have a look soon

[petyaslavova]

The issue is related to the specific word "infinity". In the response parsing we have a postprocessing callback for the list command. It goes through all items and tries to convert each value to int, float or string - in that order. In case of failed conversion, it goes to the next type.
float('infinity') produces valid float object, although in this case it is not the desired behavior.
The same will happen with strings like 'nan', 'inf', '-inf', '-infinity'.

[petyaslavova]

Closed with PR #3586