Signature of withPerl5 gives little clue as to its use.

[phlummox]

The withPerl5 function has a rather opaque signature that gives no clue that it's effectively "bracket"-ing an implicit, global Interpreter.

The function's usage could be made more obvious if Interpreter objects were explicitly allocated and finalized (rather than a single global instance being operated on). Then, withPerl5 would take a function which took an Interpreter object, its signature would give a better idea of its purpose, and it'd be more flexible, too.

This shouldn't be hard to do - the perlembed docco gives examples of how to work with multiple interpreter instances.