Fix: Do not bother checking iterable type

[localheinz]

This PR

• does not bother checking the iterable type

[codecov]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master    #26   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity        8      8           
=======================================
  Files             2      2           
  Lines            24     24           
=======================================
  Hits             24     24

Impacted Files	Coverage Δ	Complexity Δ
src/Factory.php	100% <ø> (ø)	2 <0> (ø)	⬇️
src/RuleSet/AbstractRuleSet.php	100% <ø> (ø)	6 <0> (ø)	⬇️

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