bugfix for array element updating

[JonasIsensee]

the current implementation can mess up the files for types without samelayout(T) == true.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.42%. Comparing base (bb53223) to head (8d657bc).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #685   +/-   ##
=======================================
  Coverage   85.42%   85.42%           
=======================================
  Files          37       37           
  Lines        4439     4439           
=======================================
  Hits         3792     3792           
  Misses        647      647           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.