fix: bug: funcMap not unique per engine instance.

[abiosoft]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.11%. Comparing base (c71bf6e) to head (4c54008).

Files with missing lines	Patch %	Lines
engine.go	62.50%	1 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
+ Coverage   91.05%   91.11%   +0.05%     
==========================================
  Files           3        3              
  Lines         302      304       +2     
==========================================
+ Hits          275      277       +2     
+ Misses         18       17       -1     
- Partials        9       10       +1     

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