small fixes

[kalmarek]

just before v0.5

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ed7e3f1) 96.42% compared to head (ad9335f) 96.37%.
Report is 15 commits behind head on main.

Files	Patch %	Lines
src/rand.jl	92.30%	2 Missing ⚠️
src/groups.jl	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   96.42%   96.37%   -0.06%     
==========================================
  Files           5        6       +1     
  Lines         112      138      +26     
==========================================
+ Hits          108      133      +25     
- Misses          4        5       +1     

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