Allow special values in GUC configurations

When Who What
2023-03-06 15:40:19 Stephen Frost (sfrost) Changed authors to David Christensen (davidchristensen)
2022-03-22 19:03:21 Andres Freund (andresfreund) Closed in commitfest 2022-03 with status: Rejected
2022-03-22 00:37:16 Andres Freund (andresfreund) Changed targetversion to 16
2022-03-22 00:37:09 Andres Freund (andresfreund) New status: Waiting on Author
2022-02-02 16:22:08 Julien Rouhaud (rjuju) Closed in commitfest 2022-01 with status: Moved to next CF
2022-01-12 18:58:33 David Christensen (dwc-pgguru) New status: Needs review
2022-01-12 06:55:29 Julien Rouhaud (rjuju) New status: Waiting on Author
2021-12-02 11:37:50 Daniel Gustafsson (d_gustafsson) Closed in commitfest 2021-11 with status: Moved to next CF
2021-11-12 20:24:31 Daniel Gustafsson (d_gustafsson) New status: Needs review
2021-11-03 10:35:43 Daniel Gustafsson (d_gustafsson) New status: Waiting on Author
2021-10-15 21:54:25 Cary Huang (cary) Added cary as reviewer
2021-10-15 21:54:21 Cary Huang (cary) Posted review with messageid <163433486142.1171.4374516475654161589.pgcf@coridan.postgresql.org>
2021-10-04 07:21:59 Jaime Casanova (jcasanov) Closed in commitfest 2021-09 with status: Moved to next CF
2021-09-15 15:10:48 David Christensen (dwc-pgguru) New status: Needs review
2021-09-09 09:48:37 Aleksander Alekseev (a.alekseev) Posted comment with messageid <163118091711.1167.13720085117535144549.pgcf@coridan.postgresql.org>
2021-09-09 09:48:37 Aleksander Alekseev (a.alekseev) New status: Waiting on Author
2021-08-19 22:21:34 David Christensen (dwc-pgguru) Changed authors to David Christensen (dwc-pgguru)
2021-08-19 22:21:34 David Christensen (dwc-pgguru) Changed gitlink to https://github.com/pgguru/postgres/tree/guc-sentinel-values
2021-08-19 22:20:56 David Christensen (dwc-pgguru) Attached mail thread lzlf4x6pwu.fsf@crunchydata.com
2021-08-19 22:20:56 David Christensen (dwc-pgguru) Created patch record