Order of enum constants is weird

[pjanck]

https://github.com/IFCRail/IFC-Rail-Unit-Test-Reference-Code/blob/7d544957c438cc4d95f2ab778abaa7b2dab8cf49/schema/IFC4x3_RC3/4_3_0_0/rc3/EXPRESS/IFC4x3_RC3.exp#L1238-L1260