How to reset ENV

Hello everyone,

I'm using PAR to package Rakubrew (a Raku installation and versioning tool)=
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on Windows and MacOS. I'm grateful for how easy and reliable PAR is. Thanks!

Rakubrew can act as a shim wrapper that forwards its call to other programs=
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PAR modifies several environment variables amongst others DYLD_LIBRARY_PATH=
=2E I=20
suspect that the change to DYLD_LIBRARY_PATH can have unwanted side effects=
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the called program with respect to dynamically loading C libraries.

Thus I'd like to make Rakubrew reset the environment to its original state=
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before doing the final "exec". I'm grateful for any clues on how to best=20
approach this.

Is there any place, where the original untouched environment is persisted?
Are the variables PAR adds and the ones it modifies (and how) available=20
programmatically?
Is there any chance I can hook into PAR to save the environment before PAR=
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starts changing things?

My last resort would be to hard code variable names to remove and revert th=
e=20
changes to variables it modified with some regex-foo or similar. But I'd mu=
ch=20
prefer a different solution.

Thanks in advance for any hints!

Kind regards,
Patrick B=F6ker