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golang: Switch default to Go1.17
Go1.17 is current stable Go release which, besides other improvements, compared to Go1.16 generates code that runs 5-10-15% faster(*):
It makes sense to use that version by default.
Cc'ing people who might be affected:
- caddy (@luke)
- hugo (@lu.xu)
- repman, restic (@alain.takoudjou, @jerome)
- galene (@tomo, @alain.takoudjou)
- gitlab (@alain.takoudjou, @jerome, @lpgeneau)
- grafana (@jerome)
- theia (@jerome, @xavier_thompson)
I propose, that if for some reason Go1.17 default does not work for a software-release, that software release pins Go to Go1.16 explicitly inside itself.
(*) Go blog mentions 5% speedup on the average, but it was reported that sometimes for important inner loops the speedup can be as much as 15%.