Make is_task backwards compatible

[Igoranze]

See:
#957

[codspeed-hq]

CodSpeed Performance Report

Merging #958 will not alter performance

_{Comparing 957-is-task-compatible (bad1a87) with main (f95b978)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.87%. Comparing base (f95b978) to head (bad1a87).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #958   +/-   ##
=======================================
  Coverage   83.87%   83.87%           
=======================================
  Files         210      210           
  Lines       10186    10186           
  Branches     1003     1003           
=======================================
  Hits         8543     8543           
  Misses       1376     1376           
  Partials      267      267           

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[pboers1988]

LGTM