Refactor indexBuckets() remove ArrayAccess implementation

[Tigrov]

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#308

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.13%. Comparing base (ad73d8f) to head (1bbbeed).

❗ Current head 1bbbeed differs from pull request most recent head d839389

Please upload reports for the commit d839389 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #349      +/-   ##
============================================
- Coverage     88.17%   88.13%   -0.04%     
+ Complexity      599      597       -2     
============================================
  Files            13       13              
  Lines          1378     1374       -4     
============================================
- Hits           1215     1211       -4     
  Misses          163      163              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.