Various optimization and API polishing

[tigerwill90]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.33735% with 26 lines in your changes missing coverage. Please review.

Project coverage is 90.35%. Comparing base (7034888) to head (c5c7aa6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/iterutil/iterutil.go	50.98%	23 Missing and 2 partials ⚠️
logger.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage   91.36%   90.35%   -1.01%     
==========================================
  Files          22       22              
  Lines        3554     3629      +75     
==========================================
+ Hits         3247     3279      +32     
- Misses        240      285      +45     
+ Partials       67       65       -2     

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