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Documentation for packages, which contain /usr/share/doc/libref-util-perl:

Package: libref-util-perl

Description: set of utility functions for checking references
Ref::Util introduces several functions to help identify references in a faster and smarter way. In short:
 ref $foo eq 'ARRAY'
 # is now:
 is_arrayref($foo)
Homepage: https://metacpan.org/release/Ref-Util
copyright | changelog | Debian changelog

Manual pages:

Ref::Util(3pm) Ref::Util::PP(3pm)

Other documents:

/usr/share/doc/libref-util-perl

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