Hi Hacker,
This is an innocent refactor that doesn't change logic and improve performance of jsonb_typeof() a little bit.
I have done a performance test that proves a tiny performance improvement:
With the master branch:
```
% pgbench -n --no-vacuum -T 120 -c 8 -j 4 -f test_jsonb_type.sql evantest
tps = 83290.213196 (without initial connection time)
# second run
tps = 83709.266846 (without initial connection time)
# third run
tps = 83531.014990 (without initial connection time)
```
With this patch:
```
% pgbench -n --no-vacuum -T 120 -c 8 -j 4 -f test_jsonb_type.sql evantest
tps = 84172.324715 (without initial connection time)
# second run
tps = 84082.619469 (without initial connection time)
# third run
tps = 84260.671778 (without initial connection time)
```
With 3 runs average tps, this patch makes ~0.8% improvement for jsonb_typeof().
My test script is attached, it can run against any database. And attached v2 patch file has a tiny change over v1.
Best regards,
Chao Li (Evan)
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