Fix: Combine cases

[localheinz]

This PR

• combines cases

Follows #1.

[codecov]

Codecov Report

Merging #162 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #162   +/-   ##
=========================================
  Coverage     98.26%   98.26%           
  Complexity       83       83           
=========================================
  Files            17       17           
  Lines           231      231           
=========================================
  Hits            227      227           
  Misses            4        4           

Impacted Files	Coverage Δ	Complexity Δ
src/FieldDefinition.php	100.00% <100.00%> (ø)	9.00 <0.00> (ø)

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