hence no need to be copied.

No, there is a need: For Perl to see them.

The buffers of Perl strings are subject to modification and freeing at any time. It *might* be possible to tell Perl the PV associated with a scalar can't be changed, but

In reply to Re^3: readonly access to C-level strings by ikegami
in thread readonly access to C-level strings by tfoertsch

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