fix: improve types for row

[JustinBeckwith]

No description provided.

[codecov]

Codecov Report

Merging #661 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #661      +/-   ##
==========================================
+ Coverage   96.42%   96.48%   +0.06%     
==========================================
  Files          15       15              
  Lines       13296    13526     +230     
  Branches      825      847      +22     
==========================================
+ Hits        12821    13051     +230     
  Misses        472      472              
  Partials        3        3

Impacted Files	Coverage Δ
src/mutation.ts	100% <100%> (ø)	⬆️
src/row.ts	100% <100%> (ø)	⬆️
src/chunktransformer.ts	100% <100%> (ø)	⬆️
src/instance.ts	99.82% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4910e77...64268b5. Read the comment docs.