We have `unknown_12: 1 [RS 8]` actually and this is TEXTSTYLE index.
See AC2.10 examples:
* [BLANK.DWG.gz](https://github.com/LibreDWG/libredwg/files/8088649/BLANK.DWG.gz) `unknown_12: 0 [RS 8]` (default textstyle index)
* [TS1.DWG.gz](https://github.com/LibreDWG/libredwg/files/8096654/TS1.DWG.gz) `unknown_12: 1 [RS 8]` (FOO textstyle on index 1)
* [TS1.DXF.gz](https://github.com/LibreDWG/libredwg/files/8096658/TS1.DXF.gz) DXF output from r2.17

I don't know how to implement this change, because there is `BITCODE_H TEXTSTYLE;  /*!< code 5, DXF 7 */` in include/dwg.h


TEXTSTYLE in AC1.50 .. AC1009
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : TEXTSTYLE in AC1.50 .. AC1009
Issue date:

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We have `unknown_12: 1 [RS 8]` actually and this is TEXTSTYLE index.
See AC2.10 examples:
* [BLANK.DWG.gz](https://github.com/LibreDWG/libredwg/files/8088649/BLANK.DWG.gz) `unknown_12: 0 [RS 8]` (default textstyle index)
* [TS1.DWG.gz](https://github.com/LibreDWG/libredwg/files/8096654/TS1.DWG.gz) `unknown_12: 1 [RS 8]` (FOO textstyle on index 1)
* [TS1.DXF.gz](https://github.com/LibreDWG/libredwg/files/8096658/TS1.DXF.gz) DXF output from r2.17

I don't know how to implement this change, because there is `BITCODE_H TEXTSTYLE;  /*!< code 5, DXF 7 */` in include/dwg.h


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