setting an engine.path causes the eval argument to be ignored

[kieran-mace]

Corner case for sure, but I end up wanting to toggle the eval function depending on my use case, but this is completely ignored if i set an engine.path argument.

[yihui]

Could you provide a minimal, self-contained, and reproducible example? Please also include your session info:

devtools::session_info('knitr')

[github-actions]

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