build_encoder_function behaves incorrectly for repeated string fields

[PeterZhizhin]

This piece of code (

exonum-python-client/exonum_client/proofs/encoder.py

Line 21 in 723fe8e

elif isinstance(value, list) and all(map(lambda x: 0 <= x <= 255, value)):

) leads to the following exception for repeated string fields.

I'm getting this error in Exonum launcher for the config field:

exonum_launcher.instances.instance_spec_loader.InstanceSpecLoadError: Couldn't get a proto description for artifact: dit-votings-service, error: '<=' not supported between instances of 'int' and 'str'

I would suggest changing the lambda in the following way:

all(map(lambda x: 0 <= x <= 255 if isinstance(x, int) else False, value))