Does ibc.GetPositionSize support fractional shares?

IBController
1

I don't think it does. It seems to just truncate the fraction after the integer, so 0.9 shares would be 0, and 6.9 shares would be 6.

2

IBController is open source. Everything is easily verified by looking at the source.
If you look at the source:

you would see that return value is integer.

And it is cast to integer using (int) so, it truncates any fractions.

3

Perfect, thank you Tomasz!