see if messageSizeLimit is still useful / needed

[tomholub]

In another issue - figure out where this is still used, may not be relevant

Originally posted by @tomholub in #657 (comment)

[ivan-ushakov]

@tomholub
We don't have this constant in master branch anymore. You could close this one

[tomholub]

@ivan-ushakov when this is the case, feel free to close the issue yourself - no need to ask me. Thanks!