fix: queryIterator limit field should be optional

[shanghaikid]

this related to #360

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.09%. Comparing base (9d4cc1b) to head (fed1212).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #361   +/-   ##
=======================================
  Coverage   97.08%   97.09%           
=======================================
  Files          43       43           
  Lines        2712     2715    +3     
  Branches      674      675    +1     
=======================================
+ Hits         2633     2636    +3     
  Misses         75       75           
  Partials        4        4           

Flag	Coverage Δ
	97.09% <100.00%> (?)

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