Which instrument are you trading?
I can't tell you how to find the client and server versions with ib_insync, but there is probably a way. During connect(), TWS API client indicate the [min, max] protocol level they understand, and TWS replies with its level. Levels are defined (for example):
- for Java as MIN_VERSION and MAX_VERSION in JavaClient/com/ib/client/EClient.java
- for Python as MIN_CLIENT_VERSION and MAX_CLIENT_VERSION in pythonclient/ibapi/server_versions.py
The required minimum client protocol level for fractional size support is 163. So I'm sure, TWS will send rounded sizes to a client (any language) that indicates a MAX_VERSION of less than 163.
The protocol level for the connected TWS is available through the EClient object.
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