simplify env.Unify() by unexposing occursCheck flag

[ichiban]

No description provided.

[codecov]

Codecov Report

Base: 99.06% // Head: 99.06% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (51aa675) compared to base (8dff549).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files          22       22           
  Lines        7162     7166    +4     
=======================================
+ Hits         7095     7099    +4     
  Misses         50       50           
  Partials       17       17           

Impacted Files	Coverage Δ
engine/builtin.go	99.09% <100.00%> (ø)
engine/env.go	98.94% <100.00%> (+<0.01%)	⬆️
engine/vm.go	88.36% <100.00%> (ø)

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