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I think the following functionality is not working as it should. Version 0.24.7.
I also open the text GDS, and find that it doesn't have the User Property I defined. Here is an example GDS:
HEADER 600 BGNLIB 3/18/2017 0:03:27 3/18/2017 0:03:27 LIBNAME SiEPIC-EBeam UNITS 0.001 1e-09 BGNSTR 3/18/2017 0:03:27 3/18/2017 0:03:27 STRNAME fa ENDSTR ENDLIB
You can see the property "lukas" is missing.