fix verify params in getex()

[spyinx]

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

Description of change

close: #142

[mkmkme]

LGTM, thanks for your contribution! :)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.20%. Comparing base (8d9470d) to head (3b1f34c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   76.19%   76.20%           
=======================================
  Files         130      130           
  Lines       33907    33909    +2     
=======================================
+ Hits        25837    25841    +4     
+ Misses       8070     8068    -2     

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[aiven-sal]

Thank you! I suppose we could have more tests to cover other combinations of arguments, but this should be fine for now.