Checklist

• I have included information about relevant versions
• I have verified that the issue persists when using the master branch of Faust.

Steps to reproduce

Using a faust[fast], values stored in a Table with HoppingWindow are not retrievable via the .value() function.

Inspecting the RocksDB tables via ldb, the keys (given that we store an integer as key) are on the form:

[621, [1603100040.0, 1603100099.9]]

However, when trying to retrieve the data, the key asked for is on the form:

[621, [1603100040, 1603100099.9]]

This only happens when faust has been cythonized. When running with NO_CYTHON=True, the problem disappears.

The root cause seems to be the Cython implementation of HoppingWindow.ranges returning a tuple (int, float) instead of (float, float).

Possibly related to #223, #510, but not sure about that.

Versions

• Python version: 3.8.5
• Faust version: master
• Operating system: Linux
• Kafka version: N/A
• RocksDB version: 5.17.2-3 (Ubuntu package)