Improve rev calculation

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 82.07547% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 64.26%. Comparing base (d2fe57b) to head (2645c41).

Files	Patch %	Lines
x/sqlite/json.go	76.47%	9 Missing and 7 partials ⚠️
x/sqlite/get.go	57.14%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #917      +/-   ##
==========================================
+ Coverage   64.23%   64.26%   +0.03%     
==========================================
  Files         297      297              
  Lines       19685    19755      +70     
==========================================
+ Hits        12644    12696      +52     
- Misses       6450     6460      +10     
- Partials      591      599       +8     

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